OK- Always wanted to go to Royal Gorge, so my wife says- you need a birthday trip- so I am going!
I like to try new ski areas, so I will probably go to a new one each day. The ones I know about so far are;
Tahoe XC ski Area
Tahoe Donner XC
Northstar (only 35k, so maybe)
Squaw VAlley (only 18k, but also has Olympic Museum)
For crappy weather days :
Museum of Sierra Ski History
I've never been to Royal Gorge but have many photographs as my fatherinlaw went numerous times, and from what he has told me and what I see in the photographs, it is one of the most beautiful places in the Lake Tahoe region. It has some of the best views and from what I hear has some of the best trails in the region.