Buzzkill commence.....

Groundhogs Day would be a veritable hell. You would quickly fall into the deepest of depressions, then would gradually develop psychoses. Being the sole survivor of a zombie apocalypse would be heaven compared to the mindfucking of repeating days.

Having said that, I would just become the perfect hedonist. Groundhogs would be excellent if it lasted for a relatively short and known period of time. Money, blow and whores. After about a year the mental breakdown would run full force.