...do this one. You can choose to get there either by speed boat or the slow boat, which is what we chose. Took about 90 mins to get there from Nathon Pier. The marine park is spectacular, we took a sea kayak out and were guided around one of the larger islands by a very knowledgable but slightly impatient dutch lady (i think she was dutch anyway). The crew on the boat were great, lunch was simple but just what you needed. and in the afternoon we had the choice to kayak, snorkel, sunbathe or climb to a viewing point 500m up some challenging terrain. We chose the climb which took about 30 mins to get up but the view over the islands was fantastic.
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