Activities
Calgary Art in Nature is your hosts' gallery and art centre, with regular exhibitions, workshops, courses, a cafe, and a woodland sculpture walk, all of which you're welcome to explore. Craftspeople living on the island include weavers, jewellery makers, watch carvers, potters and artists and at Art in Nature you're ideally placed to discover them.
Kittiwake Camping Hut is in the Calgary Art in Nature sculpture walk - see http://www.calgaryartinnature.co.uk/
Holiday Mull has lots of info for holiday activities. It's a stunning location for a stay, with wildlife trips, whale watching, puffin-watching / bird boats, and plenty more to see. Traces of human habitation date back to the Bronze Age, with stone circles, ruined castles and more.
Outdoors & active
Ask your hosts about hiring bikes (available on site) to explore the island.
Fishing - in sea fishing, lochs and rivers
Island hop: Staffa, Ulva, Iona are close and offer majestic scenery