Pools up here are a waste IMO. You're lucky to get two good months of use out of it, then it sits for 10 months taking up space. Besides, no matter where you are in Michigan, you're no more than 6 miles from a body of water!
I agree - with the climate I have, a hot tub is a far better investment, and even in the middle of July the temps here often get into the high 60s at 10-11 which feels great for soaking. I just turn the tub down to around 100 and enjoy the stars. Similar story with the number of lakes here as well, I have about 10 beaches to choose from within 30 minutes.