Birding. Funny that i didnt know that was even a word till 6 months ago. Bird watching- funnier that the word holds no relevance for the feathered species.
Birders will tell you that Navi Mumbai, Sewri , Uran and the Karnala bird sanctuary are havens for our ilk. Thing is for an aspiring / novice enthusiast there is no informed way to find out. For Navi Mumbai I had to ask my colleague who lives there to nose around, which he bless his soul willingly did.