Kauai or Maui?

Thanks for your replies I look forward to reading them as they come in.

I am not really looking for shopping or nightlife. I can't stand to just sit on the beach, so I like exploring and taking photo safaris.

So snorkling and exploring is more my speed.. I hear the Whale watching this time of year off Maui is cool.

We would be leaving in 3 or 4 weeks..

Thanks guys!