Onyria Marinha Cascais, Vignette Collection by IHG

Slotted between the Sintra hills and the Atlantic coastline at Marinha de Cascais, this five-star property places guests within cycling distance of both the Guincho dunes and the Cascais marina, two destinations most resorts force a taxi ride to reach.

Three pools — one indoor, two outdoor — anchor the wellness complex alongside a full spa with steam room, sauna, and a menu running from foot to full-body massage. Tennis courts, bicycle rental, and direct access to coastal hiking trails mean the grounds function as a sports base as much as a retreat.

The restaurant offers themed dinners and special-diet menus on request; a coffee house and snack bar cover lighter hours. Golf courses sit within two miles, and the hotel runs airport shuttles for arrivals into Lisbon.