whilst in Bangalore go to Whitfields to see Saed Baba, its free and quite an experience, he has a lot of followers in the UK and our local newsagent is in awe of him because I have seen Baba and he has not.He "appears" to his followers twice a dayand gives an overall blessing.Not much else to do unless you up sticks to a hill station, Bangalore "shopping malls" are a joke, but leather items good.
Take a flight to Goa from Bangalore,takes about 1 hour, their internal flights are not expensive, taxi to Candolim or Clangut and stay in that area lots of Brits but the holiday season ends in April and beware because after that is monsoon season and not worth going anywhere. I havent been to Kerela but I understand its worth going to.I dont use their coaches because their pit stops the toilets are awful, same reason I dont use their trains.