A favorite of ours. There are 3 levels (entrance, Main level and lower level). Be sure to bring good light sources. It is relatively easy to traverse. If you go to the lower level be prepared to get wet.
Entrance (short drive off of Queens Highway)
Climb down the ladder to main level.Lots of great structures on Main level. Easy walk with proper foot ware. Can be a little slippery.
Lower level has water, but I am told that it is walkable (we have not gone down here yet).