If you don’t have a Marriott Bonvoy account yet, a new offer is available for signups.

You will earn based on the following bonus structure:

• 500 points upon registration
• 2,000 points after the first stay
• 5,000 points after the second stay
• You have 90 days to complete the stays

Note that according to the terms, the offer is targeted and non-transferable, although I doubt they will enforce.