M.D.
My kids know they follow MY rules no matter where we are. If MY rule is no jumping on couches, whether Junior is allowed to or not, they are not to do it. They have known this from when they were very young for being at the park and other places.
For a long time I would ask them before we even left they house what rules they were to follow, and if the answer was not correct we'd go over the rules again. They got it very young. Even at 2.5. That might work for you too.