If youvwant to just relex and prefer some sight seeing - Diu is the right place. There are not many famous tourist places but for sure there are few which are worth like fort, church, cave et, . Nagoa beach is good, not conpared to other beaches of India but still clean and to have some fun.
I didn’t found water sports although but I suppose by now it should have been started. Thia is one of the weekend gateway from Gujarat.