Try and come up the mountain during the day and night if you have time - it is amazing how different the view is....
Easy paths most of the way but very steep to get up to the falls - not great for kids, elderly etc.
City glimpses from the Toowong stretch of River are so nice and there is a great walking/cycling path that takes you directly into the city to help you enjoy it!
The Spit - 1km down from Somerset Dam Village - is an awesome spot by the water's edge with picnic tables, bbqs, playgrounds and toilets.
