Lease a Boat?

I live in Chicago and want a pontoon boat ( I would look at others too). But, I dont want to buy becasue it is only warm 3 months out of the year. Wouldnt be worth the cost of having to keep it all year. I want to long term rent or lease a boat for 3 months and then return. I looked all over the internet and found nothing............Does anybody have leads or ideas.