accommodation appearance appearances background boat buildings colors colours contrast contrasting culture grass grassed-area homes houses lawns leisure light motor-boat moving outdoor outdoors outside park public-park recreation ripples rippling river river-views riverside scenery scenic shade shadow shadows shrubbery shrubs sunlight sunshine surfaces transport transportation travel trees vegetation views water waterways action active activity adult balance boats buoys city city-skyline cityscape dangers enjoy entertainment expensive fast handling luxury manoeuvrability mobility motion movement pastime Perth popular power power-sport quick safety skill speed speed-boat sport summer tourists water-sports wealth advice alert announcement appropriate-behavior appropriate-behaviour be-careful beware black care careful caution communicate communication concern danger dangerous drowning-danger information informing lettering lookout message observant red restricted restriction restrictions risk risks risky sign signage signs symbols text warning warning-sign watch watch-out wet yellow boating canopy enjoyment houseboat people recreational riverbank water-transportation jet-ski jet-skiing