Nokogiriyama Hike
I recommended hiking the whole mountain before going through the main attractions, which consists of 2 giant Buddha, and some great view points. The hike is maybe 50 minutes. Easily over an hour can be spent taking in the history of the place, and is around 330m high. I recommend hiking from the bottom up because you get to experience this MASSIVE ancient stone quarry. The scale of this stone quarry operation way back in the Edo era is mind-blowing. The hike to the summit includes many stairs but is not too difficult. At the top you'll find a great view of the port, Yokohama, and even all the way to Shinjuku. Aside from the awesome trails probably the 2 main reasons to come here is to see the 2 giant Buddha statues. One is actually a carving (my personal fav) and the other is the biggest Buddha statue in Japan! Highly recommend you get there in the morning. Take the ferry from Kurihama port to get there the fastest! (Depending on where you are I guess)