These are the places that will not be thrown by a coach arriving at once.
On the water
Brownsea Island works well for groups but needs the boat booked ahead, and island capacity managed. Harbour boat tours take parties by arrangement.
Indoors
Poole Museum on the Quay is free, central and a reliable wet-weather option for a group.
Gardens and parks
Compton Acres handles groups and has a tea room. Poole Park and Upton Country Park are free, level and easy to manage with numbers.
See group-friendly activities and the itineraries.