Advice on Diving in Northern Mariana Islands

...lways has warm waters and great visibility.  Ranging over 400 nautical miles, the southern limestone islands are surrounded by fringing coral reefs and the northern islands are volcanic with three still actively volcanic.  There are three paved airport runways in the CNMI: Saipan International Airport (SPN), Rota International Airport (ROP), and Tinian International Airport (TIQ).  Most flights go into Saipan from Guam, Seoul, and Tokyo.  A few flights from Japan fly directly to Rota and Tinian, but most travelers fly into Saipan first and take one of several daily flights to the other two is...