Kemah is very small, the Boardwalk is the anchor to the economy there. If I understand correctly you pay per ride, not to get in.
Sounds like fun, and the coaster looks good. You pay per ride at Coney Island too, including the historic Cyclone coaster. The picture I posted shows only a portion of the beach. It’s accessible via the New York City subway as well as by car, and can draw several hundred thousand people on a nice summer Saturday.