In the spring and early summer, go white water rafting on the Merced River in Yosemite National Park. There are different sections of the river to choose from, so whether you're a first timer or a seasoned pro with a taste for adrenaline, there is a ride to suit. Depending on the conditions and the time of year, the rapids can range from Class One to Four.

If you're lucky enough not to suffer from vertigo, spend a morning learning to rock climb with a private guide. Your guide can teach you the very basics if you've never climbed before, or take you to new levels (quite literally) if you're a pro. The experts could tackle the iconic El Capitan or Half Dome, one of the iconic sights of Yosemite National Park.

Enjoy a private tour of the national park with a guide, taking in spectacular of the Sierra Nevada mountain range, as well as beautiful granite cliffs and magnificent waterfalls. Exploring the park with a knowledgeable guide means you can benefit from local knowledge and visit spots off the tourist trails.