Steve Martin must have been busy, because it's fallen to Robin Williams to star in this pathetic, plotless excuse for a "family" comedy. Williams stars as a hapless dad who tries to pass off a business trip to Colorado as a family vacation. Along the way, the annoying clan has lots of wacky misadventures in a rented RV. That's it folks. Go rent National Lampoon's Vacation instead. 98 minutes PG.