Yes, do it! I was married in October 06 and me and my husband did it for our one year anniversary! It was so much fun and I loved weairing my dress again. We also did it at the beach and I went swimming in the ocean in my dress.
After a few days of beatiing the sand out of it. I actually through my dress inside/out in the wash with some tide and it came clean.
If you go in the water, I suggest you bring a big garbage bag with you and a change of clothes.
I want to do it again!! I dont think my husband will participate a second time.
Good luck and have fun!