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On a map, most of Brisbane looks about ten minutes away. The difficulty starts when the lovely collection of ideas you saved lives in four completely different parts of Brisbane: a winery up at Mount Tamborine, dinner in the CBD, a rooftop in the Valley, then somebody has found a bar “only ten minutes away”.
Ten minutes for one person is not ten minutes for a hens group. If the itinerary needs transport, decide that while it is still an itinerary. If it does not, keep the route tight enough that everybody can stay in the same hens without spending the night travelling between it.