Shimoda sits at the southern end of the Izu Peninsula, far enough from Tokyo to feel like a real change of pace. It is a beach town, a small port, and one of the places where Japan's long isolation from the West cracked open in the 1850s.
The history is compact and easy to walk. Perry Road follows a canal lined with old stone walls, cafes, and small shops, leading toward Ryosenji Temple, where the 1854 Treaty of Shimoda was signed. The Mount Nesugata Ropeway gives the best overview of the harbour and the folded coastline.
Shimoda also has better beaches than many first-time visitors expect from Japan. Shirahama Ohama Beach, a short bus ride north of town, is the headline: pale sand, clear water, and surf that draws weekenders down the peninsula. The town is not Kyoto, and it is not trying to be. It works because the history, sea air, and relaxed Izu rhythm all fit into one good spare day.