Düsseldorf looks expensive until you skip the Kö. The Rhine promenade, Hofgarten, Nordpark's Japanese Garden and the Kunsthalle foyer cost nothing, Immermannstrasse feeds you for under €8, and one VRR ticket covers the whole region.
A 36-hectare 1937 exhibition park with a genuine Japanese garden gifted by the city's Japanese business community in 1975 — carp pond, black pine, stone lanterns. Open daily dawn to dusk, entry free, no ticket booth anywhere.
The twisted lead spire above the Altstadt — warped in 1815 when unseasoned timber dried out. Free entry daily 09:00–18:30; inside are the 1394 Gothic tabernacle and the shrine of St Apollinaris, the city's patron.
Brutalist 1967 concrete block on Grabbeplatz. The ground-floor foyer, bookshop and Kunstverein street-level space are free to walk through; full exhibitions are €6, and under-18s enter free every day of the week.
North of the Tonhalle the promenade becomes open lawn running to the Theodor-Heuss-Brücke. Locals bring bottles from the kiosk and watch container barges; no entry, no closing time, and the sunset hits the Oberkassel skyline head-on.
Three blocks between Hauptbahnhof and Klosterstrasse hold ramen counters, izakaya and bakeries serving the 8,000-strong Japanese community. Takumi ramen runs about €12, but Bakery Bakery melonpan and anpan sell for €1.80–€2.80.
Düsseldorf's permanent open-air market since 1877, roughly 60 stalls under red awnings, Mon–Fri 08:00–18:00 and Sat to 16:00. Bread, cheese ends, fruit and a Reibekuchen stand — three potato pancakes with apple sauce around €4.
Germany's oldest public park, laid out 1769, stretching from the Kö to the Landskrone pond. Free all year; the Jägerhof palace lawn, the Jröne Jong statue and the Heinrich Heine memorial are all open-access with picnic-friendly benches.
The Altstadt's youngest brewery tap, opened 2010, with a stripped-back standing bar. Alt is about €2.40 a glass — the cheapest of the four brew-pubs — and the Köbes still marks your beer mat in pencil rather than running a till.
A 1,300-year-old riverside village 12 km north, reachable on the U79 with a normal city ticket. The Kaiserpfalz ruin — Barbarossa's blown-up 12th-century palace — costs €3 to climb, and the cobbled Suitbertus lanes are free.
The little car ferry crossing to Meerbusch-Langst runs roughly every 20 minutes, March to October. Foot passengers pay about €2 and get a mid-river view of the Kaiserpfalz that costs €14 on a Weisse Flotte sightseeing cruise.
Gehry's tilting Neuer Zollhof towers photograph best from the pedestrian deck of the old rail bridge and the Handelshafen quay. Both are public right-of-way, free, and give the skyline angle sold from the €11 Rheinturm platform.
A sandy Rhine beach on the left bank below the Rheinkniebrücke, reached by tram 704/705 or a 12-minute walk over the bridge. Free, unstaffed, and it faces the full Altstadt-to-Rheinturm panorama at sunset.