4月末から6月にかけて陸奥湾にイルカの群れがやってきます。
陸奥湾を巡航している定期船から、イルカを見ることができます。
From the late April through June dolphins travel around the Mustu bay following their food.

May is said to be the best month that you can expect high probability to meet with dolphins.
Mutsu wan (bay) Ferry service links the Kanita port in Tsugaru peninsula and the Wakinosawa port in Shimokita peninsula.
2 round cruise a day
an hour trip one way (1400 yen).

AloJapan.com