See if you can attend a service at Rijeka Synagogue. You'll learn about some of the traditions and practices of the Jewish faith.
If you're staying a while in Rijeka, Rijeka Synagogue is a good place to kick off your exploring. This Jewish house of worship is one of numerous attractions that'll keep you on the go here. Lido Beach, Maiden with the Seagull Statue, and Korzo are also ready to be explored nearby.