Take things slower at Parc del Centre del Poblenou. Take a good book to read or find a shady spot under a tree and reflect on the day's adventures.
When you've spent a bit of time at this Sant Martí recreation and green space, why not make your way to Sagrada Familia, La Rambla, and Plaça de Catalunya? They're near Parc del Centre del Poblenou and also popular with many travelers.