Sure, we saw a museum and a few churches but the day was bookended by two of the premier sports franchises in Croatia.
First was a trip to the Drazen Petrovic Center, home to a museum (closed during basketball off season), a monument to Petrovic and the court of Cibona, the powerhouse of Croatia's league and successful in Euroleague as well. Although Petrovic died with many games yet to play, he was inducted into the Basketball Hall of Fame a few years ago and there is a touching memorial to him here.
In the late afternoon, we noticed a lot of blue Dinamo shirts moving around town (not on their own - people were wearing them). We asked around and found that the popular Dinamo squad had a UEFA Champions League match in a few hours. After very little debate we found out how to get to the game and went. Although the home side lost, we had a great time and learned a few cheers (and jeers).