The park opens at 8:00am. If you go there on the weekend, be prepared to get there early and wait in line in the parking lot across the street. This place fills up quick. Bring your own floaties if you want and tie them together. Bring food and drink in non-disposable containers if you are getting onto the river. That means no bottled water, nothing in ziploc bags, no napkins or paper towel, no bags or cans of chips allowed. Use reusable plastic containers.
Pros: You can pay for the shuttle to bring you back when you finish your run that ends by the bridge. You can rent a floatie there, too. You also have access to air if you need to blow up your own floatie. They have bathrooms and an outside shower. Ability to rent canoes. Access to boat ramps and a dock for boats, canoers and kayakers.
Cons: Sometimes you can run into a jam when lots of people are trying to get in the water at the same time. Not always, just sometimes. No need to worry about disposable food if you're just hanging out at the park. Not sure if smoking is allowed in the park, but I did see someone smoking and no one told him to put it out.