Sorry for how you are feeling, it's brutal that something that's supposed to be fun like going to an amusement park with your kids has to be the source of such pain.

Just from reading what you've written:

1). You really want to go on this trip
2). You really are not comfortable sharing a room with H
3). You want the boys to stay in the room with H

I think that's your answer.

I understand there are many uncomfortable downsides to getting your own room. H put you in a tough position by just assuming that sleeping in the same room would be fine. There is nothing at all wrong with getting your own room or staying with your friends alone. They have downsides but they are not wrong.

I admire that you want to go on the trip. Personally I couldn't take it to see the WAW smiling and laughing when I was torn up inside, it was much easier to avoid those scenarios

Married 18, Together 20, Now Divorced
M: 48, W: 50, D: 18, S: 16, D: 12
Bomb Dropped (EA, D): 7/13/11
Start Reconcile: 8/15/11
Bomb Dropped (EA, D): 5/1/2014 (Divorced)
In a New Relationship: 3/2015