We are in HHI a lot - and will be moving the Grady there pretty soon.
Check out villa rentals on this site:
http://www.coastalhhi.com/
I'd suggest a villa on the north end if you want to be close to where your boat is. You can rent place for a few days - no need to book for a full week unless you want to.
Your boat is on the north end of the island. You'll be coming onto the island on Hwy 278 which comes off I-95. Right after you come off the bridge onto the island on Hwy 278, take a left at the 1st traffic light. Stay straight on that road for a mile or 2 - you'll come to a traffic circle - continue straight around the traffic circle and then you'll see the HHI boathouse on your left about 1/2 mile further - you can't miss it - there will be numerous boats (Gradys and Parkers) for sale right there as you turn in.
Lots of places to eat on the island. One of our absolute favorites is the Boathouse Restaurant right there where your boat is. They have awesome food - very fresh and affordable. They have a great patio and outside bar if the weather is good. It looks right out onto the intracoastal waterway.
Feel free to pm me if you have other questions. Good luck on yout inspection and seatrial!