We stumbled on Crane Point by accident. Quite a nice little museum with very helpful docents. The fish "lagoon" outside was fascinating.
The trails aren't much to speak of, but the center is going through a big renovation, and I think the outdoor exhibits will improve dramatically. Visit the bird rescue center. The volunteers are wonderful. Make sure you walk all the way out to the end and spend some time looking at all the fish under the bridge and dock. No fishing, but very interesting!






