This is really cool! I think this is a really under-serviced space and there's a lot of room for innovation here.

I started making https://waystops.com a while back in a similar vein, although it's more aimed at higher-level exploration of destinations and places to visit than local things to do. I use the wikivoyage dataset to power a lot of it; you may want to check that out too as there is a lot of useful data in there.