Back in 1929, before we had paved over everything natural, a Miami leader recognized what is now Greynolds Park as someplace special and worth preserving. As a result, this urban oasis provides a peek into the lush world that existed before traffic clogged South Florida. The park features one of the last intact hardwood hammocks and mangrove forests in the county. Greynolds Park, east of I-95 on Miami Gardens Road at Northeast 22nd Avenue, is fun to explore because it not only offers two lovely nature trails featuring several bridges connecting mangrove islands, but also because of its history. Its picnic shelters, boat houses, park offices and coral rock walls were built by the Civilian Conservations Corps during the Great Depression. There are several lagoons and ponds that were rock quarries in 1918. The rock-crushing machinery was buried and created a giant hill known as "the Mound." At 46 feet above sea level it was the highest point in Miami Dade County until a landfill surpassed it. When the park was built, a fort-like rock structure was built atop and today it delights Florida children who find any hill a novelty. Visitors also can rent kayaks, canoes and paddle boats to use in the lagoon, and families will enjoy an extensive playground. Golfers will find a nine-hole course built in 1964. Admiision is $5 on weekends. Here's information from Miami-Dade County Parks.