You can have tons of fun with a little bit of rum, daiquiri mix, ice, blender, old crappy putter, nasty deformed golf balls, and an apartment you won't be living in much longer. We just played like 4 hours of crazy mini golf in the apartment. It started off kinda experimental, by just putting with a crappy putter and a crappy ball. Then, I started bouncing it off a wall, and that's when we started getting creative. We: jumped water bottles, jumped up a small AND large flight of stairs, used a foosball table, used cups, bowls, putted off tables, used floor mats, car ramps, chairs, white board, clip board, bag of charcoal, bag of rice, magazines, sprite can, bowling, aerial shots, between-the-legs putting, backwards putting, and wrong-handed putting.
Good stuff.