I arrived here by bus from Trieste, there are companies such as Hello and FlixBux that offer fares from 8 Euros for the short 2 hour ride, you can buy the tickets online and have the PDF sent to your phone, very easy and comfortable bus with air conditioning and wifi that works (sometimes), its always a worry where to get the bus in Trieste the Hello bus was late, and without any signs or representation, you had to keep your eyes out for it and you got on where it parked with the rest of the busses.
Tivoli Park is a lovely large park with nature hiking, artwork, performance space, cafes, childrens play areas located a short walk from the center of town. On a warm day it’s a great place for a picnic, with some views of the whole city. A worthy destination during your trip there.
Walking around I happened upon the finals of the European Beach Volleyball championship which was being played on a court in one of the main squares. It was a fun atmosphere with a full crowd, DJ, announcer between points to get the crowd hyped up.