I cover South Monmouth County--Ocean Grove to Mantoloking. When my daughter was getting married 2 years ago, we tried to find a home, to no avail. Most of the homes won't rent out for weddings and do not rent out for only a weekend. I do have a nice rental off the beach in Spring Lake that does rent short term, but the yard isn't that big, either. And, most of the towns won't let you get married on the beach, but will allow it on the boards. The homes close to the beach rent for $10K/week, fyi. There just aren't too many of them.
We found a couple of houses in Bay Head that looked like possibilities at that time, but they were not oceanfront so we never checked them out totally.
You might want to check into some of the for rent by owner sites to see if there's anything there. Good luck with your search, and blessings on your upcoming marriage.
By the way, my daughter got married at a fabulous estate out Western Monmouth County. If you'd like the details, email me through my site or Trulia profile.