My son has gone to the swim lessons at camp last year and one time prior. The are terrific lessons and I highly recommend. Note, lesson are not always provided so inquire with them to see if they will have them this summer or not.
My son has also had swim lessons at the Country Club...but I don't recommend for the younger kids... because the water is just to cold and all they want to do is get out! Plus, I just feel it's better to learn in a pool than a lake starting out.