Yes I do know that!!
You are correct in guessing near the HH. It is right behind the HH at the Marina where you can also rent boats. If you are walking from the front of the HH. you go down between the front desk on your right and the shop and Olivias on your left and down some steps.
My fiance and I took the boat, over to DD one night back in Jan. We got lucky as the ride over was the last one, as the sun was going down and it was cold that week in Jan. and it started getting REAL cold with no sun.
It is a nice boat ride over. I plan on taking it again next time we stay at OKW.
Mike