Shikoku: The City of Kochi
It is a coastal town, though, and as such could be reached by ships traveling north and south traveling through the Pacific Ocean. And today, it remains quiet and fairly isolated, with a fairly flat main area.
Kochi wasn't a planned stop, so I feel like I missed out on some things I would have seen if I had prepared a bit more. Those samurai houses would have been a definite stop, and I might have stopped at the local museum of art, the Sakamoto museum, and possibly even the Anpanman museum.
Additionally, Kochi is known for a bonito (shipjack tuna) dish called katsuo no tataki, It looks pretty good, but timing and uncertainty of travel meant that I couldn't stay for dinner. I don't even remember having lunch there! I probably grabbed a sandwich and ate on the train ride to Kochi.
Anyway, access is not so tough from Okayama (2.5 hours) and other cities in Shikoku, though getting in from Shikoku cities might require changing trains somewhere like Marugame. In town, there are two tram lines that can help those not keen on walking get around the main sights.
Getting out to Mount Godaisan, where a temple and botanical garden are located, and beyond to Katsurahama Beach, where the Sakamoto Ryoma museum is, requires a bit more time. The best way to access both is with the My Yu Bus. A day pass is 1000 yen (only 500 yen for foreign tourists, passport required) and will let you get to both sites fairly easily. My Yu buses run about once every one or two hours.