Hmm, that's a hard one. I personally don't like long wait times for local wedding, and a DW might be different. Is 12:00 the only time you can have your ceremony?
SO,,
12:00 Ceremony, probably lasts about 15-30 minutes, then you'll take pictures after for at least an hour.. so now your at around 1:30 or 2:00, so that leaves about 4 hours before your reception. Maybe a cruise or I know some people did a gambling night, maybe some sort of activity.. Did you ask the resort or your WC for some suggestions?