Cairns is the gateway to Australia's famed Great Barrier Reef, and is a tropical getaway in its own right. Make sure to visit the Cairns Esplanade, the city's social and recreational heart. Walk, rollerblade, or cycle along the promenade. Soak up the sun or take a swim in the large saltwater lagoon. In the evening, dine in one of the many restaurants along the Esplanade.