There are a lot of trails to explore should you choose. There are also paddle boats, kayaks, canoes, and row boats that you can rent. Near the boat launch there is a concession stand that has a nice menu for mid hike snacks or lunch.
Before starting a trail be sure to check the signage. There are a ton of trails, so before you start make sure to plan a route and stick to it. If you do get lost, most trails intersect roads where you can better orient yourself.
A nice place to spend the day in the stateline.