Make Hope a lunch stop going or coming.

http://www.hopechamber.bc.ca/

The Home Restaurant on the Old Hope-Princeton Way(Exit #1 at 170 and then follow the signage back toward the Coquihalla Highway) is an old-fashioned diner that that serves one of the most gargantuan Clubhouse sandwiches I have ever seen. Plan to split a sandwich between two unless you have teenagers along.

If the weather is decent there is interesting sightseeing in the area, including the chainsaw carvings scattered throughout the town, locations for scenes from one of the great movies of our time, First Blood (the original Rambo movie) , and the Coquihalla tunnels, an amazing engineering achievement built for the old Kettle Valley Railway in the 1890s. That is about one exit up ("Kawkawa Lake") on the Coquihalla Highway (#5) and for that reason I suggest you consider taking this route on the way up if you're leaving Vancouver in the morning, and returning via Hwy. 1 to enjoy the scenery on both routes.

I concur with the previous poster that Kamloops would make a good stop, especially for somebody who has never ventured far "beyond Hope." It is a much drier climate and it just has a different feel to it, yet it's a bustling city with all sorts of good restaurants. Note that the Coquihalla takes you to Kamloops more quickly and easily than #1 for the $10 toll, but both highways are scenic and worth using as a circle route for sightseeing.

Salmon Arm, about an hour's drive East of Kamloops on #1, is considerably smaller, but a lovely town nestled against one "arm" of the Shuswap Lake, and also a reasonable overnight stop.

Happy travels!