The ferry between Rovinj and Red Island takes you to a beautiful, quiet island, with tree lined beaches. Do beware - some of the beaches are nudist!
Super beach near final stop for Koukinares bus. Cross road from bus stop and follow dirt road up and over using banana beach signs to guide you.
Beautiful water and sand with a couple of decent bar/cafe's. There is a nudie section up the far end if you want to get naked with all the other middle aged swingers. Expect to pay £8 parasol/lounger combi.
By the sea - last stop on island bus service 26(i think)