Four family friends and I are planning a ~10 day trip to Croatia. We're looking for a good balance of tourism (sight seeing nature and cities; athletic activities like hiking and biking) and unique night life (bar crawls, open air beach bars).

Any suggestions for where to go and how many days to spend? We're currently looking at Plitvice National Park, Split, and Hvar. What other islands are worth visiting and for how long?

Thanks!