Public transit between England and Scotland are excellent. If you love traveling by buses and trains with the local people, you’ll get to see the scenery. Take the train from London to Glasgow and it will pass you through some amazing countryside.
Started in Glasgow, you can wander through the Trossachs, up along Loch Ness then further North - you will find Orkney. Then down the east coast a little before cutting right across to the west coast on Skye.
From Skye you can go to Edinburgh. Finding a good B B is easy, just use the star or diamond ratings and never choose one with less than four. Getting a great B B is a lot harder and more like pot-luck. If people give recommendations try and find out why they loved the place as their reasoning may not be the same as yours. Pretty much everything is touristy.
The further North you go the fewer cars (and caravans) there are, but the narrower the roads become. Be prepared for single lane roads with lay-bys to let the on-coming traffic past. I’d recommend Doune and Stirling Castles for people who want classic castles (and Monty Python fans). Orkney is fantastic, lots of prehistoric sites along with picturesque ruinous buildings, sea cliffs, bird-life, rural views, tiny fishing villages etc.
Edinburgh is a must and the Tattoo is more than worth the modest ticket price, even if the seats are cramped and windy. Edinburgh also has some excellent galleries and museums - manage to see their exhibitions.
While being in Glasgow you should go and visit Loch Lomond where you can take a boat trip.
Wanna see Scottish park? Just to the south of Glasgow located “Scotlands Theme Park” - Its not a major park but its probably the closest.
In the center of Scotland near Stirling there is the Falkirk wheel and you can include this as part of a trip over there (visiting Stirling Castle and the Wallace Monument).
South of Glasgow you have New Lanark Scottish roads are generally quiet outside of the city.
If you are visiting Glasgow in July - visit the Glasgow River Festival and if you are into Art and Syle then Glasgow is the city of “Charles Rennie Mackintosh” and there is a Mackintosh festival on during July.
Don’t worry about getting lost in Scotland, there aren’t very many major roads and everywhere is really well signposted. Get yourself a Road Atlas covering the whole country at any bookstore, newsagents or petrol station and you won’t go wrong.