Historical with a great history, the two islands off of Perast are worth seeing with an actual stop at Our Lady of the Rock. There is a small church on the artificial island that was built many many years ago. The art, decorations and mini museum pieces give you another perspective of European history along with great views of the local hills and mountains. It's a short boat ride over and back. You want a guided tour to get the full history and background. If your time is limited, a tour of old town would be my priority but between the drive, boat ride and tour, and return, it is only about 2 hours.