wow dude!!! good luck with the proposal and everything. hope all works out...but to tell you the truth, there really isn't much to do in kona. the beaches are nice so you could probably go snorkeling and/or longboarding @ kahaluu beach (it's a pretty popular spot). or check out some of the other places. there are a few golf courses. i recomend kona country club mauka course. it's on the side of a mountain so the view down to the ocean over looking everything is awesome. (something a little romantic, i guess (dunno) ) kona is more a relaxing spot. nothing is high pace there. there are a few places to party at night and a lot of places to eat (especially if you're staying right in kona town. that's all i can think of at the top of my head right now...hope you have fun