excursion ticket; circular tour ticket
A ticket for a circular tour, allowing travel along a set route with multiple stops, often at a discounted price. Common in rail travel.
During summer vacation, I bought an excursion ticket and traveled around Hokkaido.
周遊券 is a more general term for a circular tour ticket or pass, while 周遊切符 specifically uses 切符, which often implies a paper ticket or coupon.
Compound of 周遊 (circular tour) and 切符 (ticket).