Here’s a short solo D&D adventure that I play every day.
Your destination is the university (and specifically, my lab) on the right side of the map. You will enter from the left, or west side, either from town or my house, the blue marker. There are three main entrances: 4th Avenue, on the top, which is a bit round about and only has a pedestrian walkway to the north, and also skirts the perilous cemetery; 2nd Avenue, south, which is really only for vehicular traffic and mainly gives you access to glamorous parking lots; and 3rd Avenue, the middle and most direct route. It’s difficult and dangerous to detour to 2nd or 4th from 3rd Avenue, since there are no sidewalks along College, and the roads are currently packed ice, inhabited by wandering bands of student cars.
Conveniently, there is a footpath from 3rd & College, my starting point, directly to the Science Building. Excellent! Unfortunately, it slopes gently downward, and when we get any snowmelt at all, followed by a freeze, it turns into the Slalom of Death. We’re going to get a brief thaw today, followed by a plummet once again into bitter cold. I may die tomorrow.
That same path becomes more navigable in the summer, but it is surrounded on both sides by leafy ground cover and lots of trees, and is inhabited by clouds of blood-sucking monsters in the summer, the Tunnel of Blood. The stirges hibernate in the winter, at least.
Roll for initiative. Choose your path. ‘Ware wandering monsters. I hear there are bugbears and slime beasts in the administration building off map, to the right, so don’t get clever and think you can just go around.
There is a dungeon in the science building. Also a book store where you can replenish your supplies of t-shirts, pens, and candy bars (not much in the way of books, though).