I went in October and left just after the ATMs were disabled in November for the switch in currency. I went to a Wells Fargo bank and did an exchange ( had to order the currency) so I had some rupees prior to going for taxi etc. https://www.wellsfargo.com/foreign-exchange/ Just make sure you do not get the old currency 1,000 rupee and 500 rupee notes as they will be worthless to you. Try to get as small of notes as you can. 20 rupee notes are best. The large 2000 rupee note you will have issues also as many people do not have change for it.  http://nricafe.com/guide-carrying-currency-through-indian-airports/

I hope this helps

I went in October and left just after the ATMs were disabled in November for the switch in currency. I went to a Wells Fargo bank and did an exchange (had to order the currency) so I had some rupees prior to going for taxi etc.
Just make sure you do not get the old currency 1,000 rupee and 500 rupee notes as they will be worthless to you. Try to get as small of notes as you can. 20 rupee notes are best. The large 2000 rupee note you will have issues also as many people do not have change for it. 

http://nricafe.com/guide-carrying-currency-through-indian-airports/

I hope this helps