My DM has booked a week in a holiday cottage in Dorset (Purbeck end) and my DBro and I will be joining her and our DF. My parents are in their 80s and in the last year DM's health has declined quite significantly; suddenly she can't walk far and has frequent aches and pains (she is still trying to find out what is wrong with her). DF has dementia but is more mobile than DM.
I would welcome suggestions for things we can do with them. We will have a car. In healthier times we would all enjoy country walks, pottering on the beach (rather than sitting or sunbathing), DF liked museums, DM and DF both like gardens etc.