Mumbai is big. It's full of dreamers and hard-labourers, starlets and gangsters, stray dogs and exotic birds, artists and servants and fisherfolk and millionaires. And lots, and lots, of people. It has India's most prolific film industry, some of Asia's biggest slums (as well as the world's most expensive home) and the largest tropical forest in an urban zone.
If Mumbai is your introduction to India, prepare yourself. The city isn't a threatening place but its furious energy, limited public transport and punishing pollution makes it challenging for visitors. The heart of the city contains some of the grandest colonial-era architecture on the planet but explore a little more and you'll uncover unique bazaars, hidden temples, hipster enclaves and India's premier restaurants and nightlife.