We have a mutual friend/couple that we usually go camping with together due to having kids around the same age.  We went on one trip with kids and one trip with no kids last year and didn't really have any issues.  Memorial Day weekend was the first camping trip of the season, we had SS so naturally these friends invited themselves along once they figured out where we were going.

We told this couple two months in advance when the campsite was booked how much it would cost for them to stay.  DH and I were already paying $200 for the site, to add on this couple and her two kids was an extra $80 for the weekend.  They refused to contribute to the $200 saying we would be paying that anyway weather they went with or not, but they would pay for themselves.

DH got out of work early and picked up SS at noon despite the CO stating he isn't supposed to have him until 6 p.m...  BM has a two week "vacation" planned for the end of June so DH is using this to his advantage and has already had SS for an extra 18 hours in two months.

The camping trip was a disaster. 

We arrived before our 'guests' did so everything was ready to go when they showed up.  Found out he lied at the front desk and told them he lost his parking pass and gave them DH name, so they got to stay for free. Strike 1.  Still haven't discovered if the campsite found out and charged DH card on file, he hasn't said anything and he won't because he knows I'm mad about it. 

This campsite had an awesome water park for the kids with a climbing wall, floats, etc but there was a catch:  while the pool was included in the cost of the campsite, the 'splash pad' was not and you could either purchase a weekend long wrist-band for $23 (this allowed use of all campsite amenities; bikes, splash pad, mini golf, etc) or pay $11/day.  The couple purchased weekend wrist-bands for their two kids.  They all wanted to go to the splash pad.  SIL (who also got a campsite with her family) was going with her DD so the other kids asked if they could go to.  While they ran off, we started to figure out what to make for lunch.  We had told them they had to bring their own food.  Somehow all of our frozen burgers wound up on the grill (we had enough for two meals at least for our family).  When I realized this "friend" had all of our burgers on the grill I asked him what was going on.  He said he brought burgers too but his weren't frozen so we should use all of ours first then he would cook his the next day for everybody.  Okaaay....this wasn't in the plan. 

The kids all came back from swimming and went to eat.  DH had made pasta salad and the other couple had brought chips.  Her kids wanted pasta salad.  One of them grabbed a significant amount of pasta and a burger...took a bite of the burger...decided he 'didn't like it' and tossed the entire plate in the fire pit with no warning and asked for a hotdog.  Over the course of the weekend they ate DH entire bag of snack sized chips (about 14 bags total, they had their own, but for some reason 'ours were better'), delved into our can of corned beef hash we brought for our eggs (once again..'didn't like it' and tossed it in the garbage), it was a freaking mess.  Strike 2 for 'sharing' our food all weekend without asking and wasting most of it.

Final straw...the kids wanted to go to the splash pad again.  All of us decided to go up and check it out too.  Turns out for obvious reasons any child under the age of 18 has to be supervised at all activities.  DH and I purchased a daily wristband.  'Friend' declined, said he wasn't swimming so he wasn't going to buy one.  I'm sure you can see where this is going.  We get to the splash pad and there is staff at the gate checking everyone for wristbands.  He said the kids have one but he's not swimming.  She says it doesn't matter, you need a wristband to enter and the kids can't be in without supervision.  He throws a fit and heads to the front desk at the main office to confirm.  Despite him throwing a man-trum, they will not let him enter without a wrist-band.  He says he's not going and tells the kids to go with us.  DH is a bit miffed but all the kids are now in tears thinking they can't go swimming so he just says okay (we've now wasted an hour on this) and we end up bringing all 3 of them to the splash pad. 

Would have been nice if they told us one of their kids COULDN'T SWIM.

The rest of the weekend any time we tried to bring SS to the water park her kids would rush to grab their stuff to go.  Both 'friends' refused to spend the money on a wristband for themselves.  I was getting irate, DH was getting upset but refused to say anything.  We couldn't enjoy ourselves because one of us always had to have a set of eyes on the kid who couldn't swim.  Their parents were infuriating...it's like we had a beacon on our heads...when we tried to sneak off without them I heard her yell out "oh look...you have a tag-along!" and we'd turn and sure enough there was always one or both of her kids running after us.  Strike 3.  How nice for them that they got to stay for free at a campsite in our camper drinking, tanning, listening to music and relaxing while we became babysitters.  They found out where DH and I are camping for the July 4th weekend and discovered its only 15 minutes away from their house and started planning on how they would join us.  I told DH this is on him, I've already paid DH for half the costs of this years camping trips, if his friends are going to go and not contribute then he can pay for the food because I'm not going through that again.

Campfire talk.  When the kids are sleeping.  Somehow got into talking about skids (she has four kids from previous marriage and they are now getting married next year).  This guy (who has been friends with DH since elementary school) decided that "all my problems would be solved if I told SS that I loved him".  That because DH and I are now married, it is my job to take on that role and SS needs to know I love him because he wishes his SM would have told him that.  This was right after he was sharing his woes about how the oldest teen SS has pulled the 'your not my dad!' card and how upset he was over it and the blatant disrespect being shown in the household in general.  I almost spat my coffee. 

I'm not going to go into the rest of the convo that night, but I love how some people think they have "stepping" all figured out and in the same breath they are cursing the oldest child for behavior commonly displayed by skids.

More to write later.

EDITED TO ADD: they also do not have their kids that weekend....since it is literally a 15 minute drive from their house SHE thinks she will just "come on up" on Wednesday and her almost-husband will come up on Friday when he is done with work.  Um.....no?