Just to contradict druid I walked up past the falls to Fionn loch and thought it looks like a good ride, that was in summer though and I can imagine it would be a bit moist now.
The other paths I know of are one that you can access just south of Ledmore junction that goes quite a long way, but you would need to do some googling and I’m off to the pub. I think it goes past Cam Loch for many miles but no idea how rideable it is, it might go to the falls actually.
There is one around Loch na Gaimnhich on the A894 past the falls which might be an OK pootle, and there is what I recall as a nice path up behind the Inchnadamph Hotel, and there is the path to the Bone Caves. I’ve no idea what these are like in winter and you may die horribly – beware of big holes in the ground up behind the Inchnadamph hotel, some of these have been hollowed out by cavers so they are quite deep!
The biggest problem you have is the Lochinver larder is shut so you can’t gorge on amazing pies, however the scenery should make up for that!