I'm not that fit, but I can heartily recommend ANYONE take a hike up Schiehallion... The views are pretty darned amazing, and the feeling of just BEING all the way up there is second to none...
The wonderful Mr Sweet took us there a coupla years back, and it was bloomin cold then (and he wore shorts the whole journey!), so for him to say it was cold THIS time, well... I can't imagine! ;o)
G x