Did a super ride yesterday with wifey from Princeton to Kamloops all 5A. (About 6 hours return with stops) I know the first leg to Merritt is a favorite of many of the BCSB loopers - but I was really pleased with the second section this time around.
It always seems bumpy in places around Nicola Lake, although it is still very scenic. If you've never done the ride there are many lakes to see and the pavement gets better the further north you go. The highlight for me was the fresh asphalt around Roche Lake closer to Kamloops. It looks like the crew just finished painting the lines that morning and the road was smooth as glass. Highly recommended if you are in the area.