Clooney, 48, and Canalis, 31, rang in the new decade in style in an oceanfront villa at the luxury El Dorado Golf & Beach Club. The couple, who also spent Thanksgiving in Cabo, were joined this time by friends Cindy Crawford, her husband Rande Gerber and Kid Rock.
"The group spent their days mostly lounging by the pool, chatting and drinking beer, an eyewitness tells PEOPLE. "George and Eli seemed very happy together."
Canalis's hunky Up in the Air star beau kept a close eye on her as she swam in the ocean and braved the waves, the eyewitness said. Clooney stayed poolside while Canalis splashed in the sea. The actor and the guys also golfed, a resort source revealed.
Other celebs who rang in the new year at the El Dorado were Leonardo DiCaprio with Bar Refaeli and Jessica Alba with husband Cash Warren and their 18-month-old daughter Honor Marie.
Next up for Clooney: He's been nominated for a Golden Globe for best performance by an actor in a movie drama for Up in the Air. The awards show airs Jan. 17 at 8 p.m. ET/PT, live on NBC.