Madagascar for mobility impaired

We have been advised that Mozambique may be unsuitable for travelers who are not good walkers, as most things worth seeing require a good walk or hike. That's us. Can anyone shed light on how big that problem may be for a week or so in the country to see the classic attractions: wildlike, natural beauty, human culture, etc. My wife is only good for a few minutes of walking (getting around in airports is about her limit).