Recommended hostels: Generator Paris (10th) or St Christopher's Inn Gare du Nord — both central and well-rated for solo/traveller budgets; early check-in subject to availability, drop luggage if needed.
Walk from Notre-Dame area along the Seine and explore the island; Notre-Dame exterior and bridges are accessible (interiors limited), great for orientation of Paris.
See Eiffel Tower from Trocadéro and Champ de Mars; booking summit tickets in advance recommended if you want to go up (tower open roughly 9:30am–11:45pm).
Take a 1-hour canal cruise for orientation (most run 9:00am–8:00pm); then walk the canals and visit the Anne Frank House exterior (book Anne Frank timed tickets well in advance if you plan to enter).
If you reserved a timed ticket, enter the Anne Frank House (book far in advance); otherwise explore the Jordaan or take a bike ride through Vondelpark.
Choose between Magritte Museum / Royal Museums of Fine Arts (typically open 10:00am–5:00pm; check closures) or the Belgian Comic Strip Center (often open daily).
Choose a short trip to Waterloo (museums often open 9:30am–5:30pm) or visit the free Parlamentarium and European Parliament (open usually 9:00am–6:00pm).
If you prefer an early flight, consider an airport-area hotel near BRU tonight (airport hotels recommended for early departures); otherwise stay in central Brussels and plan morning transfer.
Take direct train from Bruxelles-Central or Bruxelles-Midi to Brussels Airport (approx 20–25 minutes) or shuttle/taxi if staying near airport; arrive 2 hours before EU flights, 3 hours for intercontinental.