Stanes are great, but the natural stuff is way better. The Kenny Wilson book is great (but check his website as it has a few corrections to the routes). So much good natural riding I don’t know where to start. Torridon, Cairngorms, hills behind Blair Atholl, Southern Uplands, Harris, Pentlands, endless.
There’s a wee brown book by Andy McAndlish is great too. Most bike shops have it. Speak to Bothy Bikes if you’re in the ‘Gorms; they know a lot of good local stuff. Bike across Rannoch Moor if you’re prepared to push a fair bit. Devil’s Staircase…great descent. Take a tent and go exploring. Buy an OS map and follow the dotted lines; you can ride anywhere here as long as you’re responsible.
Make sure you’re equipped for a day in the mountains though, and can use a map and compass. And don’t expect your phone to work. And beware of the midges. Seriously, BEWARE of the midges. And drink loads of whisky. And don’t spell it “whiskey” or we’ll deport you!! And try haggis.
Post here nearer the time and you’ll probably get some guides for the day.