(Image credit: Disney; Shutterstock) May is officially here, and Disney+ is rolling out a fresh slate of notable additions worth putting on your radar. This month’s new on Disney+ highlights include an adventurous boy band travelogue, an intense new Marvel special and a unique competition series. Whether you’re looking for a road trip through the American wilderness or a supernatural showdown, there is plenty to keep you streaming. Kicking things off on May 1, "Travis Japan Summer Vacation!! in the USA" debuts with a three-episode premiere. The series follows the Japanese boy band on an epic road trip through the Rocky Mountains, splitting the group into two distinct journeys. The action ramps up on May 12 as Marvel brings Frank Castle back to the screen in "The Punisher: One Last Kill." This special finds the iconic antihero pulled back into the fight as he searches for a sense of purpose not tied to his usual cycle of revenge.…