E and I went with our friends the Orgill's to Adventure Playground in the Huntington Beach Central Park. It costs $3 per child and adults are free. They have a building area where you rent a hammer or saw and are able to build things. They boys did that for at least 45 minutes, it was way simple fun. They also had a mud waterslide, a rope bridge and a pond and raft area. It is a worth your while inexpensive way to spend a few ours during the summer.