I write this sitting in Cabo observing these majestic animals breach from the ocean while on my balcony after having seen many whales yesterday on this tour. While most have left by April, there is still a possibility of a spotting a whale and its an experience I cannot recommend enough. If you dont get seasick easily I recommend the Zodiac tour which is a small boat that allows you to get up close and personal with the whales (safely). This is also one of the more rare companies that has a marine biologist as your guide so they know the patterns and how to get the most out of your tour by spotting the whales better than some of the other regular boat captains.