Climbing is good fun, and it works out well that the UCSB RecCen has a climbing wall that stays open late. Add an odd weekend in the hills around, and SB supplies enough rock to keep any climber psyched.
Cricket. In the not-too-distant past, I constantly overlaid the world around me with a cricket field. Preparing for and playing in Inter-IIT cricket matches form some of my greatest memories of college.
Comics. Asterix, and one for the road.