Punat offers many possible activities:
Diving:
Biking:
Wake Boarding:
http://www.wakeboarder.hr/?lang=en
Wind surfing:
If the NE wind called “bura” is blowing than this closed bay is the safest place to do windsurfing:
http://www.youtube.com/watch?v=tjw0oRfVEho&hd=1
Sailing:
The biggest marina on the coast is located in Punat:
http://www.marina-punat.hr/en/marina/