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Summer is one of the cheapest yet most exciting times of the year to visit Houston, the biggest city in the state of Texas. Hotel rates drop during the season; the median hotel rate in Houston is $120 in August compared to $150 in April, according to the 2019 Travel Hacker Guide by KAYAK. There are also many free things to do. Hop aboard the Port of Houston Authority’s public charter boat for a free 90-minute cruise; take the kids to Discovery Green for some fun in the sun; admire the 64-foot-high water wall in Gerald D. Hines Waterwall Park; and walk along the trails of the Houston Arboretum.