A 40-minute bus ride from Rovinj brought me to Pula, an industrial shipbuilding town on the Istrian Peninsula. Most known to tourists for its Roman ruins, this fantastic amphitheater is well worth a visit. The basement of the amphitheater houses a fascinating museum with century-old ampuras and artifacts.
The amphitheater is a venue for musical performances and other live entertainment. The day I was there, basking in the warm Aegean sunshine, a huge group of schoolchildren got a lecture and ate picnic lunches on the amphitheater's seating.
Wander through the town and discover other random ruins and signs of the city's ancient Roman past. Or charter a boat and take a ride, viewing this city from offshore.