Update: Some offers mentioned below are no longer available. View the current offers here.Like CyberMonday sales post-Thanksgiving Day, CyberSummer is a one-day flash sale on rooms at 21 different hotels and resorts in Florida, the Caribbean and Latin America. On Saturday, June 21 - the official first day of summer - CyberSummer offers will include up to 50% discounts at four-diamond resorts, five-star hotels, and independent boutique properties.Note that CyberSummer deals will only be available from 12 AM EST to 11:59 EST on June 21, 2014. While you can view the offers in advance, you’ll be unable to book CyberSummer deals anytime before or after this period.CyberSummer features several Marriott properties, and while you can’t use your Marriott Rewards points to redeem these offers, you can still earn 10 Marriott Rewards points for every dollar you spend on them (Marriott elite members earn more accordingly). If you use the Marriott Rewards Premier Credit Card or its business version at these properties, you’ll earn an additional 5 points per dollar spent, or an additional 3 points per dollar spent if using the Marriott Rewards Visa.CyberSummer Marriott properties include:One of two swimming pools at the San Juan Marriott.San Juan Marriott Resort & Stellaris Casino San Juan, Puerto RicoSet along San Juan’s fashionable Condado beachfront with views of the Atlantic, the elaborate grounds at this Category 8 property feature two pools, including a swim-up bar, water slide, several sundecks and private cabanas. All 513 guest rooms and 12 suites have been recently upgraded, and the the 12,800-square-foot, 100% smoke-free casino has 426 slot machines and 26 gaming tables.CyberSummer offer: Non-refundable rates starting at $130 per night (normally starting at $262 per night)Valid for travel: June 24 - December 24, 2014Website: www.marriottsanjuan.com (use promo code D3Q)Marriott Rewards points earning: 1,300 per nightThe 16th-century courtyard at the JW Marriott Hotel Cusco in Cusco, Peru.JW Marriott Hotel Cusco Cusco, PeruSign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.Built on the site of the 16th-century San Augustin Convent, this five-star, Category 6 property includes three casual dining options, an indoor heated pool and a 3,229-square-foot, full-service spa. Set in Cusco’s historic city center, most of the property’s 153 guest rooms and 7 suites offer views of the convent’s original courtyard or some of Cusco’s most famous buildings.CyberSummer offer: $200 per night in a Classic Inca Room (normally $262 per night), including daily breakfast for twoValid for travel: July 1 - December 21, 2014Website: www.jw-cusco.com (use promo code SUM)Marriott Rewards points earning: 2,000 per nightCyberSummer also features several smaller beach resorts and independent boutique properties, including:The heated, oceanside pool at the Jupiter Beach Resort & Spa in Florida’s Palm Beach CountyJupiter Beach Resort & Spa Jupiter, FloridaSet along a secluded 1,000-foot stretch of Atlantic Ocean coastline, this 168-room Palm Beach County resort includes a full-service spa, the area’s only beachfront restaurant, and a poolside bar that features live music and movie nights. Guests can enjoy lighted tennis courts, as well as palm-shaded hammocks on the lush grounds and fire pits out on the sand.CyberSummer offer: $99 per night - Sunday-Thursday, $129 per night - Friday-Saturday (both normally $220 per night)Valid for travel: June 21 - September 30, 2014Website: www.jupiterbeachresort.com (use promo code CYBERJBR)CyberSummer deals for all 21 participating properties can be previewed at www.cybersummertravel.com. Remember, though, that all CyberSummer offers have only a one-day booking window, between 12 AM EST and 11:59 PM EST on June 21, 2014.Hope you score a great deal on a room!