If you want to experience some adventure activities with kids in a safe environment Riverlife in Brisbane is the perfect place.! Our son has celebrated both his 10th and 11th birthdays with kayaking on the river with half a dozen mates (and a few parents) and everyone has loved it. When you arrive the guide takes everyone through the rules and regs and lots of useful paddling tips. Both times the guides have been great explaining everything to the group, especially to the younger kids. Everyone is fitted with a safety vest and then the group hits the river. They have had such a fun time, the guide plays games in the water with them and everyone has come back very happy. I found Riverlife to be the perfect place for this age group and even older kids would love it. You can have a picnic or BBQ at the park adjacent to Riverlife, it's an easy and fun birthday party for lots of age groups.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.