Rob gave you the dirt, cost is $1.75/foot plus like $6 for electric.
You need a special adapter as all they have is 50 amp service, so I am not sure what you are.
They do rent adpaters.
Your size slips go fast.
I am running there Friday AM after I get my reservation, you can follow along if you like or follow these directions, very easy.
Come out of SS3 canal and head east toward RM bridge in North Channel. Go under bridge and stay in north channel. Plenty of deep water all the way there. You will go past hecksher park, oakdale, sayville, blue point. Look for green 35, when you see this you can start heading south, slightly east. There are red and green buoys marking the opening to watch hill. They are paired up and they are tight, maybe 50 feet across. Locate the red buoy , I think it's labeled WH2 and keep this on your starboard, then split the buoys like a football thru the goal post. There is 2 lights at the end and this is a range light. It is good for a night, but basically if you keep the 2 lights on top of each other, you are dead centered in the canal. DO NOT stray outside this channel....extreme shallow water. Take it in and slow down as you enter the opening, again stay centered between the wood canal once inside. Dockmaster is straight ahead. More than likely if you have a reservation you will be on "D" or "C" dock, which is to you right when you come in. Get your ropes ready as you come into marina, plenty of people will help.
If you decide you want to follow me out, let me know. I figure I will get to boat by 10 or 11. Email me if you want cell #.
In this chart you can see green 35 and the entrance to Watch Hill.
