In Rainy season go to Pandavkada Waterfalls in Kharghar. Authorities are strict in not allowing people to visit this place in Monsoon on account of accidental deaths in the waterfall.
Trek Karnala Fort, 13 km From Panvel
Mumbai Bombay is a short train ride away from Navi Mumbai, and many people travel to Mumbai for the day.
The beautiful hill stations of Lonavla and Khandala are less than an hour's drive from Navi Mumbai.