Keep in mind that with a lot of resort destinations (especially the Carribbean), flights tend to operate weekly instead of daily. To expect your guests to stay from Sat-Sat could be a bit much, so I'm sure it would be appreciated to select a location that has daily service, or at least reasonably timed flights so folks who don't have a lot of vacation can still make it by leaving Friday afternoon and returning on Sunday.

BTW, congrats! ^