There are many options to go and see the Blue Cave, you can get 1/2 day, day and speedboat ride tickets to go and see it depending on your time-scale and preference. There are outlets in the town which sell tickets. We opted for a speedboat ride across and 5 minutes in the cave which enabled us to experience it for 140 Kunas (around £16 for 2). The ride across to the cave is fabulous, it enables you to see all the nooks and crannies of the Island you wouldn't otherwise see. It docks close to the cave and there is a small souvenir kiosk and bar where you get your entry tickets and hop onto a smaller boat to enter into the cave. The cave is beautiful but very crowded at times which somewhat spoils what would otherwise be an amazing space. The colour of the water and the cave itself is impressive but constantly interrupted by camera flashes which does spoil it somewhat, but still I would recommend it if you are in the area.
This review is the subjective opinion of a TravelPod member and not of TravelPod.com.