There are places to the side where you can jump into the pools from rocks. Above the falls, there are small pools that you can swim through. We picked a quieter spot above the falls (by 3:30 we had been surrounded).
So the tips: get there before noon and you'll essentially have the place to yourself. The people coming to party won't drag their asses out of bed in time to get there before 3:00 pm. Have a Discovery Pass so you don't have to back track like we did. The pass is $35 and is good for one year from the date of purchase. Clean up after yourself and others so this place doesn't become a garbage dump. People had snorkel gear, we didn't know to bring ours. Bring a floaty for the water. Bring a folding chair to sit on since there are no sandy spots, it is all rocks. It's a great spot on a hot day!