Réunion runs on euros and mainland French prices, but Saint-Denis hides a cheaper version of itself: gardens and mosques that charge nothing, seafront vans selling bouchons for pocket change, and colonial mule trails reached on a €1.20 bus ticket.
Réunion's oldest botanical garden, laid out in 1767, opens free every day from around 06:00 to 18:00. Banyans, a flamboyant alley and the 1860 iron palm house shade the gravel paths, with the Natural History Museum inside as a paid add-on.
Built in 1905 on Rue Maréchal Leclerc, this is one of the oldest mosques in France. Visitors are welcomed at no charge outside prayer times, generally 09:00–12:00 and 14:00–16:00, into a green-and-white courtyard off the shopping street.
A self-guided walk down Rue de Paris passes around twenty listed Creole villas with lambrequins, varangues and shuttered guétalis. Maison Carrère, an 1830s townhouse now holding the tourist office, opens its ground floor and garden at no cost.
The seafront terrace with its row of 18th-century cannons aimed at the Indian Ocean fills from 17:00 with joggers, domino players and families. Benches face west-northwest, so the sun drops behind the Montagne ridge rather than the water.
The covered produce hall on Rue du Maréchal Leclerc trades Monday to Saturday from about 06:00. Vanilla pods, curcuma, combava and piment sell far below airport prices, and a kilo of lychees in season runs roughly €3 to €4.
Snack vans park along the Barachois seafront at midday selling bouchons — steamed pork dumplings — at roughly €0.60 apiece, samoussas for about the same, and sandwich américain, a baguette packed with fries, for around €4.50.
The wrought-iron craft hall a block inland stocks Malagasy woodwork, vacoa basketry, embroidered cloth and vanilla. Browsing costs nothing and haggling is expected — ask the price twice and you usually land 20 to 30 percent lower.
Saint-Denis's Chinese quarter around Rue Sainte-Anne and Rue Maréchal Leclerc keeps the cheapest kitchens in town: mine frit or bol renversé for €6 to €8, and grocers selling cold Dodo beer at well under bar prices.
A free forest park on the heights above Saint-Denis with tamarind and cryptomeria groves, marked running loops, barbecue pits and picnic tables overlooking the city and the ocean. A Citalis city bus ticket costs about €1.20 each way.
The cobbled 18th-century mule road that once linked Saint-Denis to Saint-Paul climbs out of the La Grande Chaloupe ravine. Even 45 minutes uphill gives sheer views over the coast road, and the paving and dry-stone walls are original.
The restored quarantine station where indentured labourers arriving from India, Africa and China were held between 1860 and the 1930s. Admission is free and guided visits run several afternoons a week, covering the engagisme story in depth.
The roadside viewpoint on the Route de la Montagne looks straight down on Saint-Denis, the Barachois and the mouth of the Rivière Saint-Denis. There is nothing to pay, and from here the sun sets over open water to the west.