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Day trip or overnight?
The are some great ones up there. Check out a list of the day trips here and over night ones here.
When are you looking to go?
Best trips would be the overnight ones to the Ribbon Reef and Far North (e.g. Mike Ball , Spirit of Freedom and Ocean Quest again during Mine Wale season (June and July)) then those to the Outer Reef e.g. Ocean Quest, Scubapro and Kangaroo Explorer).