Lucas and his crew encounter several design firsts as they create a Mexican-inspired resort in a Venice, Fla. backyard.

It's a lifelong dream for a retiring military couple in Huntsville, Ala. to have a dream pool; Lucas designs a gigantic grotto, enclosed spa and the craziest waterfall he has ever built.

Lucas builds a family size water park in a neglected backyard that includes a waterslide and double decker outdoor patio.