Have you heard of the Saran Wrap Game? It's hysterical, and people get really into it! You choose a bunch of prizes and wrap them up in a big ball of saran wrap.
The person with the ball starts unwrapping while the next player rolls dice until they roll doubles. As soon as that person rolls doubles, they pass the dice but get the ball. The person holding the ball unwraps as much Saran Wrap as they can, keeping all of the goodies they find along the way. (You can make it more challenging & last longer by having people wear holiday-themed oven mitts found at the dollar store.)
Prizes you can wrap up in the ball:
Lottery tickets, cash/coins, dress down passes for work, gift cards, gum/mints/candy, chapstick, cute socks, mittens, fancy pens/markers, company swag, etc.
Our venue (the Hop & Vine Inn in Michigan) also has an indoor pool with a projector screen, so holiday movies can be shown during the party while people float or hang out in the tropical feeling pool area. Chromecast games (like Pictionary) are free and allow everyone to use their own phone as their answer device. These games can be played on the big screen as well.
Board games/puzzles/"Heads Up" (a free app)
S'mores & hot cocoa around the campfire
Gingerbread house building competition
Have a great party!
Hop & Vine Inn