Monty, just found this event online that looks pretty cool, it is at the Miami Yatch Club open water swim by Nike Swim, different distances…on Saturday, April 9, the Yatch Club is just mintues from South Beach, you can even run there from South Beach
http://www.miamisportsinternational.com/course-map
it is held in the bay, not the ocean, but the course looks pretty interesting
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