You can rent these fancy pedal cars on the beach at Penticton. Gillian and I though of renting one to travel through the Okanagan, but keeping up with traffic might be a problem on the steeper hills ;o))
Their chief advantage is they get phenomenal mileage and have no nasty emmissions, unless of course you've been eatina a lot of chili with beans.
From Vancouver, the normal way is via the Coquihalla and Okanagan Connector (Hwys 5, 97C). This takes about 3 1/2 hours to Penticton. The old way (Crowsnest Hwy, Hope-Princeton Hwy, or Hwy 3 depending on who you talk to) takes about 4 hours. It is not recommended in the winter, but offers different views. Hwy 5 is mainly alpine, with a short cut through the Nicola Valley and costs $10. Hwy 3 takes you through the barren, rugged Similkemeen Valley before the alpine Hope-Princeton and is free. I like both. The stretch called 3A from Keremeos to Hwy 97 probably has the best scenery.
Gas up in Chilliwack - it's usually cheaper than Vancouver or the Okanagan.