Well you can ski...
There is pleanty to do here. Bike, fish, dirt bike, bloudering, hiking, rec sports,camping the list goes on. No matter what time of the season there really is no excuse to be bored (unless you're snowed in I guess)
My favorite bar is the auld dubliner in the village - they have an excellent taco tuesday. I am also partial to the Austria Hoff since it is accross the street from me. The colcktower is pretty good too, although it is strictly a beer and wine place. Many people like lakanuki and wiskey creek. There are a crap ton of bars in this town though, I am sure you could find that suits your needs.
The Volcom brothers skate park is in Mammoth, it has some really cool features. I am not much of a skater, but a lot of my friends are and they like the volcom park. There is also a little kid skate park in the Shady Rest park.
You can find a job if you look, I found jobs even during the absolute dead time. There are many threads about mammoth jobs already (ie "mammoth homies") take a look at those
First couple nights I thought maybe just some brofest parties or something....after a week or two you realize mammoth is a brofest. The gals aren't lying, haha seriously everywhere i go its 15 dudes hounding 3 girls.