On the southeast side of Saipan, the snorkeling off the Forbidden Island is a good boat-accessed dive site. It is within the Forbidden Island Marine Sanctuary.
To reach the Saipan snorkeling by air, fly into Saipan International Airport (SPN) located on the southern end of the island. It is a five hour flight from Hong Kong or a 40 minute flight from Guam.
While January to April is considered to offer the best tourist weather, the best time of year for snorkeling on Saipan is from June to August. Saipan is located outside of the typical typhoon belt, so the reefs are nearly pristine and undamaged.
Overall, Forbidden Island is the 4th most popular snorkel dive spot of all 5 snorkeling dives in Northern Mariana Islands.