across-the-river background blue bridge cars colors colours contrast contrasting freeway gray grey jet-ski jet-skiing light movement outdoor outdoors outside ripples rippling river riverside scenery scenic shadow shadows shrubbery shrubs sunlight surfaces traffic transport transportation travel trees truck vegetation vehicles views water waterways train action active activity adult balance bay care dangers driver enjoy entertainment extreme fast fun handling jet ski jet skiing male man manoeuvrability mobile mobility pastime personal-watercraft popular power power sport recreation safety skill speed sport spray summer tourists trail turn water-sports wave-runners wild daring enjoyment motion power-sport quick seated accommodation appearance appearances buildings culture grass grassed-area homes houses lawns leisure moving park public-park river-views shade sunshine advice alert appropriate-behavior appropriate-behaviour behavior behaviour caution communication freestyle freestyling information informing limitations limited restricted restrictions risk risky sign signs warning warning-sign watch watch-out Australia dare hire personal watercraft rental stand-up personal watercraft water sports boat boats buoys care city city skyline cityscape expensive luxury motor boat motoring Perth speed-boat wealth