We went to Heavenly a few years ago in February and had a great time. Free shuttles run from just about every casino and nearby hotels to most (maybe all) ski resorts in the area.
A word of caution about February, though. When we went, it was ski week for California schools (I guess similar to spring break) and it was packed at Heavenly. We found lesser crowds at Sierra at Tahoe, though.
Caesars Casino and Hotel gave us an incredible deal booked directly through their website. When we arrived, they upgraded us to a jacuzzi suite for no additional charge. Sweet!