Hilton's trying to make it as easy as possible for you to soak up the sun this summer. Its new deal in Puerto Rico will set you up with a free fourth night if you pay for three. Even better: the three nights that will cost you only start at $139 each. All in, you're saving up to $400 a trip. Resort credits are offered for golf, dining, spa treatments and other activities.

And, it keeps getting better. You could also pick up a bonus certificate for a free night down the road if you book by July 15, 2009.

The four participating hotels are solid: El San Juan Hotel & Casino, The Waldorf Astoria Collection; El Conquistador Resort & Spa, The Waldorf Astoria Collection; Conrad San Juan Condado Plaza and Caribe Hilton, San Juan. So, it's not like you're being given a low price at a low-end hotel. This is strictly top shelf.

The catch? The promotion's only good through the end of September.

Filed under: North America, United States, Hotels and Accommodations, Caribbean