Near Kelowna, the Kettle Valley Motorized Recreation Corridor is a nice area to explore on ATVs. It runs along an old railroad grade. This is a multi-use trail, and has many side trails to explore. Note: it is popular with hikers in summer months.
There are several trailheads for this corridor, including Naramata and Peachland.
Note: As of August 2008, the Ministry of Forests Regulations require all ATV drivers to be at least 16 years of age and have a valid drivers license to ride on Forest Service Roads. In addition, the ATV must have valid third-party liability insurance, which is typically around $120 per year. The Conservation Officers will issue a $600 ticket if you do not have proof of insurance.
Overall, Kettle Valley Motorized Recreation Corridor is the 19th most popular ATV riding trail of all 61 ATV trails in British Columbia.