Brisbane is the easiest big-city gateway to the sand islands and reefs of Moreton Bay. A short ferry ride puts you on Moreton Island (Mulgumpin), where the famous Tangalooma Wrecks create a shallow, fish-filled playground for snorkelers, freedivers, and first-time scuba divers. For certified divers chasing coral, day boats run to Flinders Reef, often called the closest true coral reef to Brisbane.
Topside, you can pair underwater time with dune drives, sandboarding, lighthouse lookouts, and Brisbane's riverfront food and culture. The bay sits inside the Moreton Bay Marine Park, so zoning, go-slow wildlife areas, and no-anchoring zones matter for planning. Visit in the cooler, drier months for comfortable city exploring and, on the ocean side, the chance to spot the annual humpback whale migration from headlands like Cape Moreton.