The departure point is port of gruz where you will board a boat and cruise alongside lapad penisula through the city walls of dubrovnik you will pass closely by the picturesque grebeni lighthouse on the way to kolocep island here there will be an opportunity to bathe in the magical silvery blue atmosphere of the mora spilja cave this site is also known as the blue grotto the tour continues to donje celo which has a beach stop on the other side of kolocep islanddonje celo beach is the ide