SEEING IT -- Among the many groups that offer diving and snorkeling trips is Reef Encounter , -LRB- 61-7 -RRB- 4031-7217 , www.reeftrip.com , based in Cairns , Queensland , which has trips on a 115-foot luxury catamaran starting at $ 218 for two days -LRB- at $ 1.33 Australian to the U.S. dollar -RRB- and $ 331 for three days .