You don’t have to plan from scratch. These rides pass close to Naramata, mapped and written up by route publishers around BC. The full maps and turn-by-turns live on their sites.
Naramata— Let's Go Biking · 37 km ride, passing within a kilometre
BC Gravel (BC Only)— Elbow Valley Cycle Club · 1,300 km route, passing about 2 km away
Summerland— Let's Go Biking · 30 km ride, passing about 4 km away
Getting there with a bike: province-wide buses, ferries, and shuttles are listed under Transport (some serving Naramata may be listed there rather than here).