while i'm not super-outdoorsy, this is one of the few places i can tolerate when my family needs to get out of the house and breathe in some fresh non-suburban air. there is small nature center within the park, and it's got a few animal exhibits (i use that term loosely here) that little kids might enjoy. i guess they do do some fun, little nature classes that you can register for with your kids. some are parent-involved, and others are drop-off. we haven't done one yet, but we plan on trying them out. sounds fun. there are other family-friendly activities that involve the lake too, but i advise checking out for yourself what might suit you. our kiddos are too little still for a lot of them.
the trails around the lake are super easy and kept very clean. there's plenty of parking. fairly decent bathroom facilities. and i believe that the camping areas are super cheap. really, it's a pretty great place to "escape" without having to feel like you need to spend hours in your car to get to that escape. have at it, people!