I know you like to be out in nature and since you are working out.. There is a great park like under 10 minutes from you called Kennedy Park. They have an outside gym and great walking trail built into the park.. There's a place for kids to play too. There's also tables if you want to sit and read or bring food and chill for lunch. Here's the official link: http://www.miamiandbeaches.com/parks/david-kennedy-park/101628

It's generally nice and not crowded during the week. The weekend gets a little more traffic of course.

Miami is a great place for a fitness lifestyle.