Looking for recommendations for excursion in Ocho Rios

[michelle.zhang.90]

 We are looking for excursions for Ocho Rios in December, do you have any suggestions? Originally thinking about Dunn river fall and blue hole, do they worth to go? I see most excursions do not include the admission ($23 pp for Dunn and $20 pp for blue hole). Is it better to book in advance or take a taxi when we arrive?  Also saw the river tubing.  We have two kids (6 and 8 ), they are good swimmers, will these two spots suit them? Or if there’s other ones? Any recommendation is appreciated! TIA!