For Gateway Of India visit:
Come out of station by Pf.no 1 gate(dont use subway to cross road). Walk through the foot path in front of Heritage building. There you will also find the great view of Heritage Station Building. You will find taxi's there at your side. They go for Gateway. If you want sharing(20Rs per) then just look at next corner there are Vans.
By Bus: Go straight along same side you will find bus stop. Wait at the bus stop for 111 and 112 number buses.
For...
more... Marine drive:
By walk(recommended to enjoy): Come off near pf 1 gate, cross the road by subway in front. Walk straight along the main road from front of CST building(towards left after getting off subway). Walk till big square with garden and fountain called Hutatama Chowk. You will find BSNL building to right side. Go straight by that main road beside BSNL building. Straight till end. End will be Marine Drive. By the road you will find Churchgate station & Brabourne Stadium. You will also see Oval ground with High Court Building. Everything is there it self.