The Bat Box Trail is located in Tanah Keeta Boy Scout Reservation, which in Jupiter, Florida. The campground is open at varying times throughout the year, so it is best to check the campground website before planning a visit. You can find the link to the website at the bottom of this page.
If you are unable to make a trip to Tanah Keeta, but still want to learn about bats in person, there is a variety of places that you can go in Florida. The two most well know is Lubee Bat Conservancy and the University of Florida Bat houses. Both of these are in Gainesville, Florida (links below). If you aren't up for a visit, you can learn more about the Florida Bonneted Bat through the Zoo Miami website, which is a great resource if you want to learn more about Florida's most endangered bat. They even have videos of bonneted bats in bat houses in the Miami-Dade area! Lubee Conservancy also has live cameras if you want to take a look at their flying foxes.
If you don't live in Florida, you can go online and find places where you can observe bats or watch live cameras. Some zoos house bats, whereas in other places, like Bracken Cave in Texas, you can observe bats in the wild. Just be sure to do your research and be respectful of the facilities and natural places where you visit.
Links:
Lubee: Lubee | United States | Lubee Bat Conservancy
University of Florida Bat Houses: University of Florida Bat Houses (ufl.edu)
Zoo Miami: https://www.zoomiami.org/florida-bonneted-bat