I love the American Express Sync offers. The amount of money saved has more than paid for the annual fee for my Starwood card.
You should check out your offers and see what are available. I plan to buy gift cards from Lands End, West Elm, JCPenney, Best Buy, and Neiman Marcus. I expect the sales to all wash out and earn $0 on the gift card churn. This is great as it’ll be free points!