Pat, They are growing up way too fast! 13 and 15, Yikes!
The water there is cool, but swimming is possible, on a hot day it probably feels great! We didn't have time but saw alot of brave souls.
The Rocks in the Area we stayed, called Picture Rock are beautiful lake shore cliffs they have tour boats but it was too windy and we had a list a mile long to hit so we will do that another time.
If you like natural Beauty its a great trip.
only downside is on some days in the summer they have an over abundance of "stable Flies" those suckers are annoying and numerous when present. It was pretty hard standing still to take pics. They like the lower legs, definetly pack long pants... we learned that the hard way!
al