Inspired by a reddit thread, this mod will send you to a random location when you fast travel.
The location is decided based on how far you have travelled, and a few other variables which are configurable in the MCM.
To avoid ending up outside of city walls in when fast travelling to a city (while also being in a city's worldspace), fast travelling to cities will be unaffected by this mod (I like to reason that this can still be considered as immersive because the locations of big cities are well marked and known, so there would realistically be less of a chance getting lost when travelling to them).
You have the option to disable fast travel after fast travelling until you reach a marked location (location with map marker), and can configure just how off-track you can get when fast travelling.
If you really want to get lost, I also recommend turning off your compass.
--- My Other Mods ---
Hold Guard Armour - Guard Configuration
Oops. All Creatures