I like a museum or two (usually not more) one that gives some history, another that is unique.
Walk through the downtown, if it is a nice village atmosphere with restaurants and shops.
Check out some sort of scenic area.
I find supermarkets interesting also. I don’t go out if my way, but if there is one nearby I check it. I do like staying where I have a kitchen, so that gives me more reason to checkout the grocery store.
Unique stores that have interesting business ideas. I’m usually there more to see the idea, not to buy something.
I like a nice boat ride if I’m near a body of water.
My husband likes to go horse back riding, so we do that in scenic places, although lately it is difficult for my hips. I’m not sure if I’m still going to do it.
Spending time at the pool.
I also like just hanging out in my room here and there if it’s very nice with a balcony and a view. I grew up with parents who cheaper out on the hotel, because they would say we only slept there, but I find for some vacations the hotel is part of the experience.
I like doing all sorts of things. It just matters where I am.