The Travel Hacker Guide features four curated top-10 lists: Top 10 Most Popular destinations, Top 10 Trending destinations, Top 10 Deal destinations and Top 10 Trending Beach destinations. For each destination the guide offers median airfare costs, top hotels and a 'Hacker Tip' while the Global section provides regional insights on the best times to book your flight along with the cheapest days to depart and return. Highlights from the 2015 KAYAK TRAVEL HACKER GUIDE: Top 10 Trending Destinations (flight destinations with the greatest year-over-year increase in search activity in the U.S. and Canada): - Milan, Italy - Rio de Janeiro, Brazil - Portland, OR - Hyderabad, India - Athens, Greece - Toronto, Canada - Savannah, GA - Nashville, TN - Hartford, CT - Montreal, Canada Top 10 Trending Hotels within the top Trending Destinations (hotels with the greatest year-over-year increase in search activity within the top 10 Trending Destinations): - NH Milano Grand Hotel Verdi, Milan, Italy - Miramar Hotel by Windsor, Rio de Janeiro, Brazil - The Benson Hotel, Portland, OR - The Park Hyderabad, Hyderabad, India - Royal Olympic Hotel, Athens, Greece - Shangri-La Hotel Toronto, Toronto, Canada - Dresser Palmer House, Savannah, GA - Omni Nashville Hotel, Nashville, TN - Avon Old Farms Hotel, Hartford, CT - Hotel Ruby Foo's, Montreal, Canada When to book guidelines: - For visits to the Caribbean, book just two to four weeks prior to departure date. Depart on a Thursday, return on a Tuesday. - For trips to Europe, book six months out; it's also best to leave on a Wednesday, and return on a Tuesday. - For travel within North America, book four to six weeks prior to departure date. Try to leave on a Friday and return on a Monday. "We are committed to making travel planning better by giving people more information before they book," said David Solomito, North America brand director for KAYAK. "We've made the data featured in the KAYAK 2015 Travel Hacker Guide highly visual and easy to reference, which we know is ideal for travelers who are hungry for hacks to make trip planning as simple as possible." Related Link: Kayak 2015 Travel Hacker Guide