It would be a shame to visit India just to work on your suntan. People come to visit the sites, for a change of scenery and to get a taste of a completely different culture, and come back from their trip transformed.
India is such a culture shock that you have to see it to believe it. As you walk through the streets you'll realise you can't possibly be bored: you'll fall in love with the colours, you'll remember the flavours, and your spirituality will be tested with all the different religions...in short, you'll be charmed, and your senses will testify to it.
The culture is of course one of the distinctive features of a trip to India. Soak up the different cultures that coexist in the east of India. Visit the Mahabodhi Temple, the birth place of Buddhism, or Kamakhya Temple, the home of Hinduism.