Whilst you're down in Kamakura, you should go see Zeniarai benten (
http://www.asahi-net.or.jp/~QM9T-KNDU/zeniarai.htm). It 's a shrine built in the hollow of a volcano, you have to walk through a tunnel carved through the rock. If you find the little shop in there, you may be able to see the white albino snake they keep on site for the gods.