The mid-range, 15-room Little Conch Key is located on a tiny private island a short drive from Marathon and the Keys' airport. Standard rooms are smallish, but villas and cottages are worth the upgrade, with full kitchens as well as sitting and dining areas. There’s a small but beautiful beach (not swimmable at low tide), free kayaks, and a nice outdoor pool (though there's little space for sunbathing). It offers a relaxing and low-key stay, so don’t expect luxury or a ton to do. Still, it’s a great pick for families and groups.