Depends on what you are looking for. I just spent 2 nights in a 2 bedroom fully equipped oceanfront condo at The Palms which was great. They have 1 or 2 bedroom units and 2 bedroom with lofts that may accommodate your whole group. Also spent 2 nights right in the middle of town at the Holiday Hotel. Also oceanfront and as convenient as you can get. They have a few little sections of rooms which would be great for a small group- rooms 9, 10, 11, 12 or 5, 6 ,7. Would kind of give your group some privacy and a place to congregate outside of the main hotel lobby or porch. Not full kitchens but most have a fridge and the location can't be beat. They do have 1 suite with full kitchen, etc.
Email me for more info or details. There are also 3 or 4 bedroom units or houses on the island - depends on your price range and needs.
Where are you thinking about for the mainland?