Kubokawa is the terminus of the JR Dosan Line from Kochi, Takamatsu and Okayama. It is also the starting point of the Tosa Kuroshio private railway, which crosses overland past Cape Ashizuri to Sukumo.
From Okayama, a stop on the San'yo Shinkansen Line, there are seven daily Nanpu limited express trains which run directly to Kubokawa in 3 1/2 to 4 hours depending on stops (¥7170); otherwise you can make an easy connection in Kochi to the Ashizuri limited express train.
These train trips are covered in the Japan Rail Pass.
Kubokawa is small enough to cover on foot.
Kubokawa is famous for its pork, which you can even find as handy souvenir packs.
In Kubokawa you will find pork, beef, and an abundance of produce from the fertile banks of the Shimanto River. Among the recommended items are shiitake mushrooms, shimanto-nori (fresh water seaweed), strawberries (in season), and best of all aromatic Shimanto rice.
Dabada Hiburi (ダバダひぶり) is a locally made chestnut shochu (spirit). It is famous throughout Japan, and therefore the supply is very low and demand extremely high. When the annual batch reaches the stores (in the Fall) it is sold out immediately. However, you can order it by the glass at many bars in Kochi who were lucky enough to snatch a bottle or two. Enjoy!