Not that it's technically allowed, but I used to doa workout where I would Bike from the parking lot at Petersburg to the top of Minnewaska, and out to Lake Awosting. I'd carry running shorts and shoes and a jogbra, plus a bathing suit, in a backpack. Once I hit Awoting, I'd ride a mile around the the far side and dump my running stuff in the bushes, then ride back to the beack side, ditch the bike, and swim across. Pick up dry running clothes, and then run around the lake 1 and a half times back to the bike, bike back to the car. About 11 miles on the bike, 5 miles running, half to one mile swim. Fun cause you can do it yourself (also good with friends). We took the dog once or twice too! The one time we got yelled at for swimming outside the boundaries of the lake they said it was OK for the dog to bein the water but not for us. . .
It's hard to be brave when you're a chicken.