Amtrak Guest Rewards members can earn one point for every dollar spent on Zipcar reservations. Zipcar is the world’s largest car sharing service with Zipcars in Boston, Chicago, London, New York, San Francisco, Toronto, Vancouver and Washington, D.C.. Rates vary by location. For example, in San Francisco, Zipcar members who use a Zipcar at least a couple of times a month will pay from $7.44 an hour or $55.25 a day and from $50 a month with no annual fee; or if you need a Zipcar only on occasion, you will pay from $8.75 an hour to $65 a day with no monthly commitment but with a $50 annual fee. Gas, parking and insurance is included in these rates.