Sounds like you, on your own, changed your plans to benefit these people. They didn't ask you to do it and therefore probably are not even aware of the inconvenience for you.
I suggest that one should never make plans to make someone else happy unless that person requests something specific and they're important enough to you that it makes you happy to do it.
Take care of yourself. Is it too late to change your wedding to the time you want it? If not I'd do that. Then let them know what you've planned and what you're willing or able to do as far as accommodations go. You take charge and you'll feel less cranky.
It's my motto to please myself first unless I know for sure I can do something to please someone else as well as myself. Especially, for something as important as your wedding, you should be happy. You and your fiance' are the ones to please first.
Yes, I'd be cranky. And I'd learn from this that not everyone is the same as me. You like to visit in their homes. Apparently it's not important to them. It doesn't mean they don't love Troy and thus you. It just means they're different.
When they didn't answer re: babysitting, why continue to bug them? Make your plans based on your needs. I think you're trying too hard to please which gets old after awhile.
If you're taking the whole day to visit and not enjoying it, don't do it. Whatever you do, do it for yourself first. Don't assume someone else wants you to do something. Only make accommodations based on stated wishes. Did they say they only wanted to stay one night? Sounds like all that was important is the pool.