Europe! You're so quirky. Specifically one Crowne Plaza Hotel in Denmark, which rewards guests who peddle on electricity-generating exercise bikes for 15 minutes with food. How long would I have to ride for a minibar pass?
Once a hotel guest has produced 10 watt hours of electricity (which takes about 15 minutes), they're rewarded with a $US36 meal voucher. Pretty good deal! It's also not the hotel's only green initiative - it also has solar panels affixed to the roof.