Is it possible and indeed worth walking around the city walls or would it involve walking along busy road?
I will be in Marrakech for 4 days and rough plan is as follows:
Day 1 - Walking (or cycling around Marrakech) including walk around walls if feasible and visiting gardens.
Day 2 - Bus to Essaouria for day trip
Day 3 - Mountain biking
Day 4 - Bus to Setti Fatma to see valleys and mountains on day trip (or more mountain biking)
Might mean rushing Marrakesh itself but not interested in shopping and will have evenings in Marrakech anyway.