Sliver Sands and LazyE both offer great derby packages (thought I've not tried either). I'm wondering how Ames Farm is....
Also I love the location of West Alton Marina and launch. They have done a lot to create a legit camping area there....may even try it this summer.
We have a big crew of 8-11 guys and a few kids and 4+ boats so we have gone the "vacation rental" route. For less per person that a motel/hotel, we have been renting a house with 3-4 bedroom and lots of space, big kitchen, docks, and generally a nice place to hang out after a day on the water. We saved money by not renting in Weirs, Gilford, Laconia areas and instead endure the 45 minute ride to derby HQ each night.
We also stay at the Bayside every year. Immaculate rooms, nice hosts, good company and the docks couldn't be any more convenient or closer to good fishing.