My first reaction to HP was British “HP Sauce,” kind of like A1 in the USA, and you should definitely have HP sauce with some meal in Scotland! Burger, roast, haggis, fries (chips).
Our trip planned this July, has sadly been postponed until medically doable. Anyway, the 2 big cities, Glasgow and Edinburgh, are packed with sights. In the scenic countryside, the Glen Coe valley is incredible. At its western end is the city of Glencoe, and just north, Fort William, at the base of Scotland’s highest mountains. They’re not huge like in Colorado, but they’re mighty and stunning nonetheless.
And get off the mainland and onto an island. Skye, just west, is reachable by ferry or bridge. It’s like another world, with stunning mountains, rock formations, coastal scenery, and sheep, lots of sheep. Stay at the Hazeldean B&B on the western side of Skye, and have dinner at the outstanding Three Chimneys. Orkney, off the northern tip of mainland Scotland, reachable by ferry or plane, has scenery but also lots of historic sights. Some dating to World War II, and some thousands of years ago, to Viking and Neolithic times.