For an enjoyable late afternoon evening with low costs, walk along the broadwalk (CBD river walk) and across the Storey Bridge to catch sunset behind the CBD from the cliffs. Then stroll back over the bridge and into China Town. Alternatively, then walk back to Southbank and back past QPAC to the CBD. Photographers will have a ball. The Goodwill Bridge is excellent for a short cut back to the CBD if you want skip the bulk of Southbank.