Our daughter goes to college in Oneonta and when we go visit her with the trailer we always camp at Susquehanna Trail Campground
. It's a good home base when we visit her.
It’s convenient to the college, just outside the town of Oneonta. We always get one of the sites in the back area. The sites are open (not much shade), but they’re flat spacious sites with full hook-ups - but no WiFi. The owner is very nice and accommodating. It does have a pool, that looks nice, but we've never used it.
If you are looking for a home base (i.e., a place to set the trailer up and sleep while visiting relatives), if Oneonta is close to the people you want to visit, Susquehanna Trail Campground would work out well.
However, if having WiFi is a necessity, there is another campground in Oneonta - Deer Haven Campground
. This campground has full hook-up sites and WiFi, but its entrance is a very steep gravel road. We’ve driven through it, but have never stayed there.
There’s a lot of campgrounds around Cooperstown, but we’ve never camped there so we can’t provide any insight or information on those.
Hope this helps some.