Hello Annie,
I will keep this short and sweet. In binary fashion.
You have clearly identified the good points of Uist, however you have raised some concerns. You will need to visit otherwise these concerns are just bullet points on a list.
Indeed, there is no M&S, Harrods, Woolies and the such like, there are numerous local shops, supermarkets and local fare.
If you need to buy anything there is the Internet. The calmac fares are reasonable enough for the odd tour, and there are few trees, other than an abundance of Rowan [mountain ash] and planted conifers.
I think what I am trying to say is, if you are trying to escape the rat race or 'chill out' then I would not worry about the trees or gardens. Between the scenery of the mainland and the Isles, there is no contest. I am sure you will enjoy planting your own trees and watching them grow.
In summary, There may be a sacrafice to pay in terms of what you are used to, but I am postive that within hours, your 'cons' bullet list will be in the bin.
I hope you have a great trip,
E |