Connecting Princeton and Penticton via Summerland, this section of the Kettle Valley Rail (KVR) Trail is one of my favourites. It is quiet and scenic, trail conditions are overall good, a bit sandy in some spots and you may come across washouts, which usually have bypasses. You'll be climbing rail grade. There are many spots to drop off the trail and continue on the Princeton Summerland Road, be prepared for some rolling hills that are not rail grade and possibly washboard. Personally, I'd stick with the trail.
There are no services, be prepared for anything and be bear aware. The trail passes through some ranchland, please be respectful and close any cattle gates you come across.
Camping: If overnighting, there are rec sites, such as: Crump, which is right on the trail, there's another past it but I cannot recall the exact location. Trout Creek Rec site is located just off the KVR at 49.647001, -119.921540, has a pit toilet and access to to the creek.