There are some good near by options in the area.
Might be a good option if you have a larger family or if you want to share a space with other people who are also attending the wedding.
A little further away from the church and venue but close to the Islip Airport.
Go for a nice stroll eat some ice cream and check out the dock and gazebo.
A lot of good food options.
Nice small art gallery.
Local well regarded small brewery. Relaxed atmosphere but only standing tables, no seats.