Any suggestions for fun Christmas party games?

I am having a Christmas party with a handful of my coworkers-maybe 20 or so-and need ideas for fun games to keep the night interesting. We work in the ER and are mostly in our 30's, young couples, maybe a small child or 2 also. I am hosting the party at a hotel-the presidential suite-and my hubby will be cooking. Should I go with a full meal or several appetizers? The hotel is located right on the beach in Hawaii, so maybe MaiTai's at the pool before hand? Thanks in advance.