I went to Lake Livingston mainly to camp overnight and hang out with a friend and her dog. She kayaked and her dog swam along. I kayaked a little and then walk around the park a bit. I had alredy hiked all of the trails in this park a year ago, so I wasn't that motivated to hike all of them again.
Lake Livingston is a nice, large lake and a great place to camp. If you go on a weekday (like we did), it's virtually empty. On the weekends, it can become very crowded.