The Polipoli State Park is one of my favorites. There is great swimming holes you can swim in that arent too aggressive. There is also a great place to do some cliff jumping, and all the locals hang out here jumping. One thing I like about this park is that it is close by the town where you can walk to and get lunch. There are some really great restaurants with yummy local food. They have a smoothie shop that is incredible with so many different flavors. Highly recommend. They have some great places where you can rent body boards. We rented some for the morning and had an absolute blast. Seems like this park was pretty busy when we were there. The paths are filled with people walking, running, roller blading and skateboarding. Lots of dogs too. There are picnic tables and those seemed to be all taken with people eating lunch and hanging out. I would recommend getting there early in the day if you want a good spot.