Knoydart is class. Went for a few days with a couple of mates at the end of April. Took the train to Glenfinnan, (where the Harry Potter train to Hogwarts goes over the viaduct!), climbed to 800m and pitched camp
After a wild night I woke up on an island...
The weather was poor, so we made use of a few bothies. This one had electricity!
This one didn't
At Sourlies, the bothy was full, so back to the tarp. The wind came on pretty strong on the coast though, so tarp pitching became an engineering exercise to withstand the battering of wind and rain in the night!
Spectacular scenery though
The view from the Old Forge in Inverie
I would thoroughly recommend it. Everyone is so helpful up there as well. We walked from Glenfinnan to Inverie, and then intended to take the ferry from Inverie to Mallaig to get the train back to Glasgow (great journey, fantastic views from the train). The ferry only runs every other day, and takes about 25 people, but there were about 40 of us waiting on the Quay, so they commandeered another couple of boats for the rest of us for a hairy ride through the swell. The landlord of the pub was also very helpful. He pointed out a nice bit of woodland near the pub where we pitched for the last night, so we would be handy for the ferry.
Knoydart has the lot, wild spaces, mountain walking, coastline, and is remote enough to really feel you have made the effort, but is quite accessible using the train/ferry combo. We will probably return to explore some more!
,,,,enough said!) and 3 around Torridon ( more mountains, more forests, more lochs, just beautiful) without too much driving between these areas. 
