Originally Posted by Mahalo
Definitely return the rental car to Avis the night before. It is only about a 10 - 12 minute walk back to the hotel and you won't need to unnecessarily pay for a night of parking. The Avis shuttle won't be any quicker than the Sheraton Gateway Shuttle and its one less thing for you to do and therefore you will be on your way to LAX faster.
Didn't know about the doggie daycare at the Westin LAX but I've always enjoyed the Sheraton Gateway so didn't see a reason to try Westin but everyone on FT seems to rate this hotel poorly anyway.
Is the Gateway shuttle exclusively for the Gateway, or does it make a lot of stops like the Westin one?