My husband and I are traveling from Atlanta to Miami then plan on traveling down the keys..any advice!!?? We were wondering mostly when the off seasons were and when it's cheapest to travel there. Also, when's the best time to purchase air-line tickets? I've been looking today and noticed Round-trip is around $600 and up for both of us! Whoa, that's a little steep. We really want to go in early-mid august.