I'd go for something hardy like lillipillies along the pool - provided that you don't mind losing sun in either the morning or afternoon depending on which way the side faces. If you want to keep the pool nice and warm go for something a bit lower like a mix of tropical plants like ginger, small palms and bougainvillea which will add lovely colour. I'd caution against bamboo as they drop quite a bit of leaf litter and are very water hungry. As for the shady areas not sure but perhaps some pretty river pebbles as 'mulch' interspersed with a few shade-loving tropical plants like you see at hotels. But not too many plants as this will make the area darker.

Lovely area, and living in Queensland you can grow lots of lush plants and they reach full size very quickly, Rhapis palms, large elephant ears, Xanadu as an under plant , bromeliads for structure and colour and you will have a lush tropical look in no time

I have a planter box running the length of my pool - about 8 metres. I am looking for some evergreen low maintenance plants to provide some greenery as in the illustration below. IF anyone can help with suggestions that would be appreciated.

Yes both golden cane and heliconia will work in that position, Xanadu is lush also and very tolerant of sun and shade, researching tropical /palm nurseries near you, or the site bigreader suggested you will get advice for the area you are planting. There are some wonderful plants that will give you that tropical look.