Tip Nº 01
Pick HafenTraum bike rental if you're already staying there (€10/day, no extra deposit, return same day or next morning). Jugendherberge rental is similar at €10-15/day with the advantage that it's directly on the Weser cycle path — saves you 1km vs the HafenTraum start. Both rentals include a U-lock and Bremen cycle map. Bring a phone holder if you want offline navigation; the Komoot app's free version covers Bremen offline.
Tip Nº 02
Do the Wallanlagen-Weser-Bürgerpark perimeter loop (30km, 2-3 hours including stops) on day one to get oriented. From either hostel, ride south to the Wallanlagen windmill, follow the green-strip cycle path west to the Weser, west along the south bank to the Beck's brewery, cross Wilhelm-Kaisen-Brücke, north along the north bank past Schlachte, continue to Bürgerpark via Findorff, hour-long stop at Stadtwald beer garden, loop home. Free, flat, half a day, peak Bremen.
Tip Nº 03
The Stadtwald beer garden in the Bürgerpark only has bike parking — no tram, no bus within 600m — so the bike is the gatekeeper to one of Bremen's best Sunday spots. Haake-Beck on tap €3.50 the half-litre, locals with kids and dogs, summer season May-September 11h-22h. Tucked into the woods on the lakes — properly different vibe to the Schlachte tourist beer-garden strip.
Tip Nº 04
Watch for the bike-pedestrian-mix Schlachte rule on Sundays in summer. The promenade closes to motor traffic May-September Sundays and becomes shared bike-pedestrian — works fine but ride slowly past the food stalls and beer gardens. Outside Sundays the Schlachte cycle path is the standard separated lane on the river side; the pedestrian path is on the bar side.
Tip Nº 05
The 25km ride to Vegesack (north, along the Weser) is the under-publicised Bremen cycle day trip. Flat the whole way, ferries from Vegesack across the Weser run hourly and connect to Bremerhaven if you fancy combining bike-day-trip with German Emigration Centre visit. Bring a packed lunch from the Hauptbahnhof ReWe — the cycle path stretches without supermarkets between Bremen-Nord and Vegesack.