Vegas

Me and my boyfriend are planning to go to Vegas this December. I am scouting for a package deal with hotel and round trip airfare. While I am planning to go from December 19 - 23 I gotta wonder how busy they will be... He loves poker and anything associated. So, I am not old enough to gamble, you have to be 21 I've heard....so I'm trying to find activities for me to do other than shopping! I'm thinking about a day trip to the Grand Canyon National Park. If anyone reads this and knows about the area, feel free to post comments with advice!