The Citi Prestige Card is my favorite card out there, given the combination of a great sign-up bonus, excellent return on everyday spend, and huge perks. Arguably the most generous perk of the card is the fourth night free benefit, where you can get the fourth night of a hotel stay free when booking through the Prestige Card. You do need to book through the Citi Prestige concierge to take advantage of the offer, though the good news is that you still earn points when booking through them. Furthermore, the benefit is valid at a vast majority of chain hotels (as well as many independent hotels), and you can even use it to book AAA rates, pre-paid rates, promotional rates, etc. Simply put, I consider it to be the single greatest perk offered by any credit card. You'd think the benefit would be rewarding enough as is, though many cardmembers who recently took advantage of this benefit are reporting receiving a free $50 Amazon gift card by email, "as a small token of [their] appreciation and your loyalty:"
By One Mile at a Time