If you're an adventurer you'd be delighted with Rainbow Beach. It's a feast for anyones senses.
The beach is a surprise, in all my 50+ countries I've visited to I've never seen something like this. The magnitudes of colours are immense. As you walk along the beach you'll see all shades of oranges, whites and black grains of sands.
You can also walk up the sand dunes a little bit and you'll have to be careful of cars as 4WDs can drive on the beach.
Overall I'd recommend a walk (takes about 30 minutes walk from the main beach to see the full extent of the colours) and a picnic!
Romantic & adventurous!