The Sanjay Gandhi National Park in Borivili is a wildlife sanctuary, claimed to be the only such reserve in the world within a city's limits. It's worth a visit for its heavy cover of trees, diverse fauna, streams and lakes. Looking for some action? Do a bit of rock climbing or explore the Kanheri Caves carved out by Buddhist monks in 1 BC. Travelling with kids? Check out Essel World, one of India's biggest entertainment parks.