The walled Old Town of Dubrovnik is a UNESCO World Heritage Site and ultra-popular place to visit on Croatia's Dalmatian CoastgettyActive travel (cycling, hiking, paddling, etc.) has been a red hot growth sector of the travel industry for the past several years and continues to surge. At the same time, Croatia has been a fast-growing emerging destination for Americans going abroad. But while several foreign countries have seen significant growth of U.S. tourism, Croatia combines these two trends in a big wa ...