Jogasaki
The bottom part of the Kanagawa prefecture is a large peninsula called Miura. At the very end of the peninsula is Jogasaki and a small island right off the tip called Jogashima. The area is famous for delicious Maguro 
The Keikyu train line, which I use everyday to get to work, is also the train line that goes down to the end to Jogasaki. They also have a special pass that includes train fare, Maguro lunch, and entrance to the aquarium.
The gf and I hiked around and explored Jogashima and Jogasaki, ate a delicious Maguro bowl for lunch, took a ride on the glass bottom boat, wandered around the aquarium, took a long walk on the beach, and had even better Maguro sushi for dinner.
