outdoor weddings

Lessings caterers has a pavillion at Sunken Meadow state park. I think they are the largest caterers on LI and they have a great reputation.

i don't know how helpful my response is since I can't give you any names b/c I don't know of any, but you might want to try some of the resorts further out east on the Island. My best friend got married in Maine on a Sunday at a resort and made it a weekend affair. Guests arrived Friday nite and we bowled that nite, played golf, went boating, shopping, etc. on Saturday, and the happy couple got married the following day. We got the rooms at a really cheap rate b/c so many of us were spending the weekend there (a sort of mini-vacation). It was FANTASTIC!