• Train back to the start on the Cascais line, which stops at Cais do Sodré, Santos, Alcântara-Mar and Belém, so kids only cover one direction on foot
• Mixed surfaces of smooth paving, limestone and cobblestones in places, which can jolt small scooter wheels
• Little shade by the water, so on hot days go early in the morning or toward sunset

A mostly dedicated walking and cycling path along the Tagus, running about 7 km between Cais do Sodré and Belém with almost no climbs. Kids can scooter or bike past the Alcântara docks, under the 25 de Abril Bridge, past the MAAT museum and the old Tejo power station.

It ends at the Monument to the Discoveries and Belém Tower. Some stretches detour around roads and buildings.