Little Crystal Creek is the classic Paluma Range stop north of Townsville: clear water, small cascades, rainforest shade, and a handsome old stone bridge framing the swimming holes. It is easy to reach by car but feels like a proper change from the hot coastal plain.
The creek is popular for picnics and swimming, especially on warm weekends. Check local conditions after heavy rain, use the formed access points, and combine it with the drive up to Paluma if you want a fuller day in the national park. The water can be cold, which is half the pleasure in North Queensland.