Historically part of Moldavia, the territory of what became known as Bukovina was, from 1775 to 1918, an administrative division of the Habsburg Monarchy, the Austrian Empire, and Austria-Hungary. After World War I, Romania established control over Bukovina. In 1940, as a result of the Molotov–Ribbentrop Pact, the northern half of Bukovina was annexed by the Soviet Union, and nowadays is part of Ukraine.
In today's terms, travelling to Bucovina implies travelling to Suceava County, northern Romania, and perhaps venturing over the border into Ukraine through Vicovu de Sus (daytime only) or Siret(24hours).
Fly Tarom directly from Heathrow to Iasi,Romania. 2 hours transfer to Suceava,the gateway to Bucovina. Alternatively,you can fly to Bucharest(various carriers) and then on to Suceava Airport with Tarom(45min internal flight).
Unfortunatelly Suceava has been seriously let down by succesive leadership in the last 20 years and it has lost the character of provincial capital it once had, mainly through ill-thought developments.
2-day leisurely round trip by car While in Suceava, visit the ruins of the old castle (Cetatea Suceava), have a read about Stephen the Great and then head west for the mountains. Plan a circular route that takes you to see all the famous painted monastries of Bucovina. Voronetz is a few miles south from Gura-Humorului. Then head north to Cacica(visit old salt mine), Solca, Marginea(famous for locally made black pottery). Then on to Putna Monastry, where Stephen the Great lies burried. Sucevitza and Moldovitza are two other monastries built by Stephen the Great after his victories against the Turks. Head southwest to Campu-Lung and Vatra Dornei,a resort that offers great skiing in winter and fabulous mountain walks in summer. You can return to Suceava via Gura Humorului.
Fancy another 2 days in the mountains? From Vatra Dornei head south to Ceahlau Mountain (1907m altitude). Great for hiking, with designated paths and walks through Ceahlau National Park. Camp in allowed areas or stay in a local chalet/pensiune. Next day visit Bicaz Lake and Bicaz Locks (Cheile Bicazului) and head back to Suceava via Targu Neamt.
The road to Borsa (no. 18) is catastrophic. It is full with holes, so unless you really need to travel, choose another direction. For a distance of 25 km, you can go at the maximum of 20 km/hour. Also, with motorcycles you really need to choose another direction.