Check out Southern Maine Community College. They have a great venue right on the water and you can bring in your own vendors. Good luck.Posted by HE&ME
Back in December you said you were planning a spring wedding so you are probably already married but putting this out there just in case anyone else is looking through the boards - you might have more luck looking up elopement packages (which is what my FI and I are doing) they typically include Location, Small Cake, Officiant, Witnesses (if needed), an hour with a photographer (just check - some it is just a hotel staffer with your camera - others it is a professional photographer and they give you the disk/rights to the photos they take), Bouquet and Boutinear(sp), and one or two night hotel stay. We found several that are designed for the couple but you have the option of adding guest for a set dollar per guest.
One that I liked and we may book is Berry Manor Inn. http://www.berrymanorinn.com/pdf/ElopementPackages.pdf
I also know you requested ME but here is another sample of the elopement style packages that I mentioned earlier in NH...