Alexandria Bay NY option
The DW and I just returned from a boon docking trip and can't say enough good things about "Uncle Sam Boat Tours" when we arrived at about 7pm I spoke with the owner in the office and told him we were going to tour the "Singer and Bodlt Castles" with then in the morning. He was more than happy to allow us to park in the tour bus section of the parking lot overnight. He only asked that we move to the overflow lot by 8 am before the tour buses arrived. Not only that he sent a shuttle van to pick us up from his over flow lot and brought us back to the dock.
Once we retuned from our tour about 6 hours later, the shuttle can took us back to the MH. We found the staff to be great and very pleasant to us boondocking!! Plus the tour was great too.