Take the FGC train to Baixador de Vallvidrera (S1 or S2 line from Plaça Catalunya) and you're at the entrance to Collserola Natural Park. The Carretera de les Aigües trail is completely flat with panoramic views over Barcelona - perfect for all fitness levels.

Trail distances range from 2km easy walks to 15km+ challenging hikes. The Font del Bacallà route takes you through pine forests to natural springs. Best part is it's completely free and you can escape the tourist crowds within minutes of arriving.

Bring water and snacks since there's only one small café near the park information center. Trail maps are available at the visitor center or download AllTrails before you go.