Link your American Express card, write an approved review on TripAdvisor, get $5. Details at sync.americanexpress.com/tripadvisor:
Get a $5 statement credit when you connect your eligible American Express Card with TripAdvisor and leave one posted review (approved by TripAdvisor) before 23.59 (EST) on December 31, 2013.
You must connect your American Express Card to TripAdvisor to be eligible to receive the $5 statement credit. Quantities are limited. Only one $5 statement credit per connected Card. Your Card must remain connected until the statement credit is applied. Statement credit may not be received if a review doesn’t meet TripAdvisor’s qualifications and is not posted by TripAdvisor.