Mile Marker 100 (Central Key Largo)
The dive capital strip with everything walkable
This is the busiest stretch of the Overseas Highway, anchored around MM 100 where the Caribbean Club, Key Largo Fisheries, and the John Pennekamp State Park entrance all sit within a short drive. Most dive shops cluster here, including Rainbow Reef and Conch Republic Divers off Ocean Bay Drive. Restaurants like Mrs. Mac's Kitchen and Snapper's on Seaside Avenue stay packed. The downside: US-1 traffic is loud, and oceanfront access is split between resorts. Pick this strip if you want to walk to dinner and roll out to a 7am dive boat without a long drive.
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