Hi Rutwa, While Kerala can be visited all time of the year, it is better to avoid Andamans during the summers.Traveling to Kerala is easy, flights are cheaper, train and public transport is available from Chennai and Bangalore. Andaman has limited options of costly flights and cruise. Traveling in Kerala is not possible in one go while a week is enough for Andaman.
It is best for you to decide that what kind of vacation you are looking for. Here are few suggestions created by real travelers on Tripoto. Please take a look. Thanks!