West of the coast of Portugal, the Azores Islands are a very cool destination to explore by mountain bike. Matter of fact, it has become quite a mountain bike mecca over the past few years.
To reach the mountain biking on the Azores, you can fly from Boston in the USA via SATA Airlines into Sao Miguel. There are easy inter-island flights or ferries available to reach the other islands.
Overall, Azores Islands is the 7th most popular mountain bike trail of all 9 mountain biking rides in Portugal.