The hills behind Albufeira are older than the resort that made the name famous. The barrocal — the limestone shelf between the coastal strip and the Serra do Caldeirão — was farmed by Moorish settlers a thousand years before the first hotel rose on Praia da Oura. Their terraces still hold. Their wells still draw water. Quad biking Albufeira exists because of those farmers, not in spite of them. The dirt tracks that operators use were cut for carts and mules, linking almond groves, fig orchards and carob trees across ground too broken for the plough. Carob remains the signature crop of the Algarve interior; Portugal supplies a substantial share of the world harvest, and the gnarled dark trees along these trails are working stock, not scenery. Cork oaks appear higher up, their trunks stripped in nine-year cycles and painted with the year of the last harvest. Paderne anchors the region's history. Its castle, raised in taipa — rammed earth mixed with lime — dates from the twelfth century and passed from Almohad control to the Order of Santiago in 1248. The ruin sits above the Quarteira stream, reached by a Roman-founded bridge later rebuilt in medieval stone. It is one of the seven castles depicted on the Portuguese flag. Below it, the valley floor grows orange and lemon; above, the schist ridges turn the soil a deep rust red that coats every vehicle by mid-morning. The wider landscape carries no gate and no admission charge. Entrance is free, at 0 EUR, with operators charging only for guided quad bike rental and the machines themselves. That distinction matters. What visitors pay for is instruction, insurance and a guide who knows which riverbeds run dry in August and which farm tracks are private. Today the interior faces depopulation. Villages like Alte, Salir and Querença have lost residents to the coast for four decades, and rural tourism now supplies a meaningful part of what remains of the local economy. Guided quad biking Albufeira tours pass through hamlets where a single café serves the whole parish, and the traffic they bring is not incidental. The terrain rewards attention. Sinkholes and dry stone walls mark a karst system riddled with caves. Bee-eaters nest in the sandy banks each summer. Azure-winged magpies cross the tracks in loose flocks. The Serra rises to just over 500 metres at Monte Figo — modest by any measure, but enough to put the whole coastline in one frame.