I took the tact that Bob01 recommends. I got five PADI specialties while on southern dive trips. I got the course books before I left and did the open water dives either as part of the regular dive schedule or as extra dives. It was a lot easier and more convenient that trying to fit into someone elses schedule. I will be completing Rescue Diver in the Cayman Islands this fall.
PADI still requires 60 dives and five specialties plus Rescue Diver to get a Master Diver certification. Which should not be confused with Dive Master.