Additionally to Beaches, Food, and Shopping following is interesting:
Dumboka
Bay, fishing, walk ~800 m
Vidikovac, Marinska
Beautiful view, nature, bay, fishing, walk ~900 m
Kartodrom Bura
D501 11a, 51241 Križišće (call them first) ~4 km
Primorje-Gorski Kotar County
Aquarium Crikvenica
Nature ~13 km
Bakar
Old town, restaurants, promenade ~16 km
Vidikovac Mahavica (Eyes of Vinodol)
Beautiful view, mountains, nature ~16 km (narrow mountain road)
Biserujka Cave
Nature, walk ~22 km
Trsat Castle in Rijeka
Old architecture, restaurants ~25 km
Maritime and History Museum in Rijeka
Museum of the Croatian Coast ~25 km
Ivan Zajc in Rijeka
Croatian National Theatre ~25 km
Lika-Senj County
Senj, Nehaj Fortress
Old town, architecture, restaurants, promenade, museum, view point ~40 km
Plitvice Lakes
National park, hiking, beautiful nature ~140 km
Istria County
Učka
Nature park, hiking, mountains ~50 km
Hum
Old town, architecture, smallest city in the world ~65 km (narrow road)
Rovinj
Old town, architecture, restaurants, promenade ~110 km
Brijuni
National park, hiking, island ~120 km (and ferry)
Pula, Citadel, Arena
Old town, architecture, restaurants, museums ~130 km
Famous cities to visit in 1 day
Zagreb ~160 km
– Karlovac ~110 km
– Samobor ~165 km
– Velika Gorica ~165 km
– Sisak ~205 km
– Varaždin ~240 km
– Bjelovar ~240 km
– Čakovec ~260 km
– Koprivnica ~260 km
Rijeka ~25 km
– Poreč ~130 km
– Pula ~135 km
Trieste, Italy ~100 km
– Venice, Italy ~250 km
Zadar ~220 km