Depends on what you want to do aside from driving, but Kaslo is a gorgeous, quiet little place that's fun to check out. There's so nice walking trails on the edge of town that are easy and a nice way to stretch your legs after all the driving. I've driven all but the Castlegar > Kaslo and Kamloops > Spences Bridge parts of this loop, some of it was a little while ago though so I can't comment on current conditions. I do know we saw 4*C at one point on Hwy 6 between Cherryville and Needles in late May a few years ago, idk what was going on be definitely keep an eye on weather forecasts.
Also keep in mind what kind of fuel you need, some of the more remote locations might only have questionable 91.
https://www.google.ca/maps/dir/vanco...49.2827291!3e0