For me it comes down to doing fun things in beautiful places with great friends. That could be challenging classic test-pieces, or relaxed days out.
In recent years I've particularly enjoyed my onsights of Wings of Unreason, Left Wall, and Suspense. In 2011 my battle and final victory with Quietus was pretty fun. My weekend hit on the Badile Cassin was my most enjoyable 'type 2 fun'. Ticking Rubicon quickly was satisfying, as a weak non-sport-climber.
Any time I get to climb with my wife is golden too.