There's even a suggested reading list for guests so they can brush up on their destinations before sailing off.

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For example, Santa Barbara Vacation Rentals in Southern California offers a free grocery shopping and delivery service for guests who complete a list 72 hours before check-in, and the items will be waiting in the unit when they arrive.

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The Jet Propulsion Laboratory's confirmed list of "VIP" guests included celebrities Alex Trebek, Chuck Lorre, Wil Wheaton, Nichelle Nichols, Bill Prady and June Lockhart.

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