advice alert appropriate-behavior appropriate-behaviour behavior behaviour caution communication dangers fast freestyle freestyling fun information informing jet-ski jet-skiing limitations limited manoeuvrability mobility movement outdoors outside pastime power-sport recreation restricted restrictions risk risky river riverside safety sign signs speed sport transport transportation travel warning warning-sign watch watch-out water water-sports waterways wave-runners action boat coastline estuary jet landscape low Mawddach mountains mudflats outdoor power tide wales welsh calm echo evening forest Jetty ladder lake mirror molo nature peace pier quay silence summer surface wooden architecture boats canoeists canoes city dock England english Great Britain London modern paddle skyscraper thames blue boulder canada canoe cliff enormous holiday huge leisure reflection rock Rockies small tiny vacation abseiling cliffs climbing coasteering Cornish cornwall danger pleasure rocks sea swimming cutout isolated man people person sail stand strenght surfer surfing swim wind windurfer windurfing Baltic board extreme waves wet windsurf windsurfer windsurfing windy