Glen Lake is very small and nice, Lake St. Catherine is beautiful but lots of motorboats and houses, my personal favorite place for kayaking or small boat sailing is Chittenden Reservoir. Chittenden reservior is very little known, it has pretty much the cleanest water ive ever seen in a lake in VT, theres no houses and very few people on it. Highly recommend. Keep an eye out for big rocky shores for spots to sit on a rock and eat or swimming. my favorite spot is on the right (from the lot) theres like a bay ish area and a boulder you can climb and the water is very deep.