My inlaws, especially when my SIL and her husband go too, don't travel the way we do at all. We like to do and see everything, eat at nice places, stay at nice hotels etc. If we spend the money to go somewhere, we don't just want to sit around while we are there. They can sit in the hotel room for hours, see maybe 1-2 things out of 60; and spend an hour somewhere that we would stay most of the day and be ready to leave. It used to drive me crazy because I went nuts just sitting there and felt really guilty if we did everything without them. My DH used to always tell me let's just do our own thing, join them here and there if it is something we want to do, and let them join us if they wanted to or if it was not to late to get tickets, reservations, etc. He always said his parents would understand. After a while, I gave up feeling guilty or missing out on things and now that is what we do. We usually don't even stay in the same hotel they do on trips, because they go for whatever is cheaper and we go for atmosphere. It works out fine and now we always have a good time with very little stress. We don't know what BIL might say behind our back, but we don't care either. You shouldn't have to give up all the things you like or want to do on your vacation. I agree just add them to some reservations so that if they get there and want to go with you they can. The rest of the stuff, you have told them what you are going to do and have given them the option to do it with you- the rest is up to them.