Step back for a moment, about the justifications.
We have to not (or minimize) interact with other people, in order to reduce the risk of catching or spreading covid19. Where such interaction is necessary, reduce risk: do it outdoors, wear a mask, keep your distance, improve ventilation with outdoor air, avoid crowds.
We have to not be responsible for a contribution to demand upon the healthcare system in general. Means, on top of all the usual stuff, avoid risky activities or actions.
"should I ride my motorcycle"? -> can you "not crash" while riding your motorcycle? -> There are no absolutes, but you can tilt the balance, in many ways, in either direction.
"should I go to the cottage"? -> can you not fall out of the boat, or twist your ankle on the steep path or in the woods nearby, etc.? -> Again there are no absolutes, but many ways to tilt the balance in either direction.