as a lifelong boynton fisherman, yes there are a lot of blacktips in that area. you even find highly pregnant females upwards of 100 lbs in 4-5 feet of water. when you get out of the channel areas there is generally no that much boat traffic either. when i lived in yacht club i caught hundreds of sharks from the seawall there. and there used to be a european lady who would swim there at night even when we had sharks on the line jumping around! it is a year round very accessible fishery.
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Southeast Florida kayak launch sites at http://www.floridakayaksites.info