Build boats & rafts from natural materials
Pond/stream, risk assessment, feathers, bark, dried grass/foliage, first aid kit
Hand out a feather to each Beaver/cub. Task them to make a boat or raft from this and any natural materials foraged in the vicinity. Discuss safety aspects about being near water/picking prickly/stinging plants. Test out the crafts when completed, to see which float/sail.