Mumbai previously known as Bombay, is the capital and the largest city of Maharashtra state. Mumbai is a commercial capital of India and a predominant port. It is also a movies industry mecca known as Bollywood. It is a cosmopolitan city and a blend of the old with the new. Mumbai has two UNESCO World Heritage sites: Victoria Terminus Station and Elephanta Caves.
Major tourist sites in and around Mumbai: Victoria Terminus, Gateway of India, Global Vipassana Pagoda, Mahalaxmi Temple, Jehangir Art Gallery, National Gallery of Modern Art, Marine Drive and Chowpatty Beach, Mahatma Jyotiba Phule Market (Crawford Market), Haji Ali Mosque, Flora Fountain, Mani Bhavan, Siddhivinayak Temple, Juhu Beach, etc.

Tourism Board Website

When to visit: best time to visit October to March. March to May are hot and humid. June to September is monsoon season.

HOW TO REACH

Nearest railway station: The major stations are Chattrapati Shivaji Terminus (formerly Victoria Terminus, known just as VT), Dadar Terminus, and Kurla (Lokmanya Tilak) Terminus. The Western line connects to the Western states of Gujarat, Rajasthan, and some parts of North India. The main terminal are Mumbai Central and Bandra Terminus.
The Konkan Railway travels through the picturesque Konkan coast of Maharastra and is a good way to travel from/to Goa and Kerala.

For detailed train timings and other information log on to www.indianrailways.gov.in or https://www.irctc.co.in/nget/train-search

Nearest airport: Mumbai's Chhatrapati Shivaji International Airport (IATA: BOM) (ICAO: VABB) is about 28 km (17.3 mi) from the city center.

For more information see section TravelInfo/Airports/Mumbai/Chhatrapati Shivaji International Airport 

Buses: Mumbai is well connected by buses with major destinations in India. The MSRTC (Maharashtra State Road Transport Corporation) commonly known as ST, operates services to Mumbai from various cities in Maharashtra state through Mumbai Central Terminus.

Get around: Mumbai is connected by metro system. To use the system, either buy a smart card and load it with credit or buy a token each time you want to ride the metro.
Mumbai also has an extensive Suburban Rail Network commonly referred to as "Locals", with three lines — the Western Line, the Central Main Line, and the Harbour Line.
All parts of Mumbai are connected by buses. They are cheap, but also quite crowded most of the time.
Hop On Hop Off (HOHO) bus service is operated by Maharashtra Tourism Development Corporation (MTDC). Tourists can take a ride from Chhatrapati Shivaji Maharaj Terminus (CSMT).
Mumbai is well-serviced by smartphone-app based cab-service providers. Popular services are Ola and Uber.
Auto rickshaws (also called tuk-tuk or simply autos) are good for shorter trips.
Cycle rickshaws are good for short distances, or places which are too far to walk but too short for taking a bus/taxi/auto rickshaw.

By road: National highway numbers 3, 4, 6, 8, 9, 17, and the Mumbai-Pune expressway provides links to all parts of the country.
The distance from Pune to Mumbai is about 148 km (92 mi) via Bengaluru - Mumbai Hwy/Mumbai - Pune Hwy. It takes around 2-3 hours.
The distance from Nashik to Mumbai is about 166 km (103 mi) via NH160. It takes around 3 hours.
The distance from Ahmedabad to Mumbai is about 550 km (342 mi) via NH 48. It takes around 9 hours.
The distnace from Goa to Mumbai is about 583 km (362 mi) via NH 48. It takes around 11 hours.
The distance from Bangalore to Mumbai is about 998 km (620 mi) via NH 48. It take around 15-16 hours.
The distance from Chennai to Mumbai is about 1300 km (807 mi) via NH 48. It takes around 22 hours.
The distance from Hyderabad to Mumbai is about 708 km (440 mi) via NH65. it takes around 13-14 hours.
The distance from New Delhi to Mumbai is about 1407 km (874 mi) via NH 48. It takes around 24 hours.