Islas San Esteban and San Pedro Martir: Walk up a desert wash, to search for desert birds and the endemic pinto chuckwalla — a fat, harmless desert lizard. Later visit Isla San Pedro Martir, a 1,000-foot-high guano-covered island that is home to thousands of seabirds. Blue-footed boobies, red-billed tropicbirds, pelicans and frigatebirds are all found here.
Isla Rasa: See thousands of nesting Heermann's gulls and terns on this incredibly distinct island.
Isla Santa Catalina: Search for marine life and hike among the giant barrel cactus on one of most dramatic islands in the Sea of Cortez.
Isla San Marcos: Explore via kayak, walks and snorkel.
Isla San Jose: Take Zodiac cruises and kayaks into mangrove channels in search of shorebirds and waders. Nearby are ancient shell mounds, or middens, that reveal traces of former occupation by the Guaicura Indians.
Los Islotes/Espiritu Santo: Swim and snorkel in turquoise waters, perhaps with some curious sea lions. Zodiac rides, rare bird sightings, the possibility of spotting an endemic black rabbit, or simply some relaxing beachcombing are all possibilities today.