I like the hole in one challenge on those par 3's on the blitz games, however I think there should be a single player game that only has these challenges. Maybe a nearest the pin game where you can bet creds on the hole, for example like a dart board 50 for the bull 25 for the outer ring, or just like a archery ring.
Each game of 9 holes single play you can bet whatever you want or a limit made on the hole. Hit the outer ring and you get a multiple of what you gambled. So if you play 50 creds on the hole and you hit a hole in one you get say 100 times what you gambled, or if you hit the inner ring you win say 10 times what you gambled and outer ring maybe 5 times what you gambled. Gets you a few extra creds I guess