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Friendly fishing charters.
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A dolphin cruise with them is excellent. They have biologists on board and are laid back and fun. Free parking on site.
The key was the capital of the Calusa realm across Southern Florida in the 16th century when Spanish colonization of Florida began. Spain's attempt at colonizing Mound Key in the mid-16th century was unsuccessful and ultimately abandoned in favor of St. Augustine, but the key can still be visited today, where the pile of discarded shells and archaeological digs mark the site of pre-Columbian civilization.