B.R.
I think that prizes for lowest score, highest score and any "Hole in Ones" would be fun. I recently went to a party that had a scavenger hunt theme...the prize for the wining team was $10 gift cards to a frozen yogurt store, the 2nd place team won $5 Dairy Queen cards, and 3rd place team won the movie theater style boxes of candy that you can get at Walmart for .97, and then everyone received a decorated sugar cookie (iced) with the birthday girl's monogram on it, individually wrapped in little cello bags with some curling ribbon.....everyone was thrilled with their goodie bags/prizes.
Have fun!