yesscotland.com says:
If you are wondering why go to Arnisdale, then by the time you get here you will already know. Apart from Knoydart which is only accessible by boat although it is on the UK mainland, only Applecross and Arnisdale are so remote and Arnisdale only has one way in and out! Visitor accommodation is in short supply here although there is an hotel, B&Bs and a camp site in Glenelg a few miles back. From Arnisdale, though, you can get boat acess to Knoydart but not on a scheduled basis! The hills behind the village Beinn Sgritheall (974m), Beinn nan Caorach (773m) and Beinn a' Chapuill (738m) offer good leisurely walking and fine views from the top but just across the Loch lies Ladhar Beinn (1019m) just asking to be climbed! If you are such a mind to climb it, let people know where you are going and when you intend to be back - just to be on the safe side.