At 50 years old I have more memories from Ft. Gibson lake than I can remember! Lol The dam site up on the hill has a great view if you can find a time when it's open. The dam itself is a very impressive structure basically in the middle of nowhere.
There are multiple spots around the lake for camping or just day trips and a hotel near the lake too so it's got what you need. It's definitely worth seeing.
w(°o°)w
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Finding this spot open is the hard part and it's really overgrown this time of year (prolly why usually closed) BUT it's still worth the wait.