Go to Applecross via the mountain road, single track road and hairpin bends but spectacular, not to be missed and at Applecross visit the Inn for excellent food and drink. On the way out, follow the coast road through Glen Torridon to Gairloch and Ullapool. I live in Gairloch and it's true about the rain and midgies! Past Ullapool visit the Summer Isles then Lochinver and along the coast road past Scourie, the scenery is superb. Don't go to John O'Groats, it's tackier than Blackpool. Along the top, visit Strathy Point, Dunnet Head for the puffins and Castle of Mey where the Queen Mother lived. On the east, go to Chanonry Point at Fortrose to see the dolphins come in with the tide.
This is only a small sample of what Scotland has to offer. At the places you stay, ask the locals, they know all the best places to visit.
Hope this helps.