Hopping on the Children's Railway is fun all season, but this Sunday will be even more exciting for kids. To start with: everyone below 18 can travel free of charge (trains leave every 40-50 minutes). Then at Hűvösvölgy station, you can join family-friendly activities: face painting, colouring, board games, workshops, a bouncy castle, an obstacle track, and a photo shoot. You can see a firefighter's truck or board an old-school bus.
See the timetable here.
Photo: Rockstar Photographers - We Love Budapest