No doubt the naturalistas will frown at this but, I’d nip up to Nevis Range and spend a day on the gondola bombing down the red and world cup routes. Then any remaining energy gets spent on the Witches Trails.
If riding around Kinlochleven I reckon there’s better riding than the Ciaran Path, which is a bit bloomin climbey for a descent. If you can find the stages from the Dudes of Hazard enduro last November, they are absolutely superb- climb up the landrover track past Mamore Lodge, then down the loch eilde or grey mare’s tail paths. It’d be like riding down a dried up river bed, if they were drier 😉
Alpine Bikes does hires from Fort William main street, I’m sure- not certain if they have normal bikes at Nevis Range or just downhill bikes.