One of the best things about New York state are their parks. They keep their parks in excellent condition.
Seneca Lake State park is lovely. You can see from the pictures that they have a huge
playground with bathrooms right next to it. There is also a substantial sized
splash pad next to the playground. We only paid $7 to get in, which was $1 per person. On the weekends you can use the beach and swim in the lake. They only have lifeguards on the weekends.