At home reception after a destination wedding

We are getting married in Hawai‘i with family and close friends. We’re hosting a dinner reception afterward and a luau rehearsal dinner. I’m trying to figure out how to do the at home celebration. So far I’ve booked an indoor lodge at a local park. We planned on catering in bbq and liquor from a local place. My questions then are what “reception” stuff do you include? We want this to be a fairly laid back/casual party.

Wedding dress or no?
DJ? ( we thought karaoke might be fun? we also have friends that play music and sing and may want to do some songs but not all night)
Cake cutting?
is it boring and awkward if there’s not a “schedule” and DJ like a regular reception?
obviously I realize the options are open but just looking for suggestions! Maybe a photo booth ?
Also can I continue the Hawai‘i theme or is that inappropriate since some aren’t going to hawaii with us? If we do, any suggestions for fun Hawaiian wedding favors that aren’t a waste?
Looking for any suggestions just trying to gather ideas!
thanks!!