Is it easy to get from San Fran Airport to Avis Car Rental? We do not travel often and we'll have a 4 yr old with us, so I didn't know if this was a realistic option for our family?

It's pretty easy. There is an air train that takes you straight to the car rental.

The Avis is in the airport. You'd just have to take the train to the car rental area and you'll find Avis there.

Its easy. There is a train from all terminals to the car rental area including Avis

Agree about signing up for Avis Preferred. Couldn't have been slicker for us.

Extremely easy and convenient. I've done this many times, and as others have posted, there is a tram that travels s continuous loop between SFO terminals and the car rental vendors. Between waiting and riding, expect at most 20 minutes.

Yes its easy, it is on site. Plan for extra time due to having to ride the provided sky-train there. I would suggest signing up for the free Avis preferred program. It allows for a quicker check in.