Whale-watching is the principal reason people visit Guerrero Negro, as hordes of friendly California grey whales (up to two thousand at a time), which spend most of their lives in the icy Bering Sea around Alaska, can be observed (at remarkably close quarters) from within the nearby Laguna Ojo de Liebre (aka Scammon’s Lagoon), thrity minutes south of town. It’s a magical experience – and many visitors actually get to touch the whales, which sometimes come right up to bobbing vessels after the engines are switched off.
Organized tours begin in Guerrero, but you can also drive to the lagoon and hire a cheaper panguero (boat) yourself. Take Hwy-1 south for 9km and look for the sign to the Parque Natural de la Ballena Gris. From here it’s 6km along a rough dirt road to a gate (which someone will open, but only during the whale-watching season Jan–March), and another 18km to the lagoon. You’ll probably be asked to pay the park entrance fee here.