Originally Posted by
Savage25
Take a taxi from the domestic terminal to the Intercontinental. Keep your bags with the concierge, buy a spa package (I think they start around Rs 1000), work out in the gym, get a massage, steam bath, shower, whatever. Have dinner at one of the restaurants in the hotel. Take a taxi to the international terminal. Much cheaper than a day room, and will easily kill 5 hours.
BOM has the 9W domestic lounge which is pretty decent - light, airy, got wifi - though not a place I want to spend 8 hours in.
Leave your bags at the left luggage counter, go out and see some sights in the city .. maybe the beach / marine drive etc.