The Railway Museum at Omiya-ku in Saitama Prefecture. Tickets to the most popular activities are gone soon after opening, but the museum has enough attractions to spend an entire day.
Oscar, Peter & Erik:
Arne & Frans:
Undokai (Sports Festival) at Tsukudajima Elementary School (?????).
Himaru, Arne & Shin-chan (Shinsuke):
Ryousuke, Peter & Kensho:
Mosquito Guard: