In Florida the following national parks offer free entrance day from
Canaveral National Seashore
Castillo de San Marcos National Monument
Dry Tortugas National Park
Everglades National Park
Gulf Islands National Seashore
For a complete list of National Parks that offers free park entrance this weekend go to the National Park Website.
You can find a Smithsonian Museum Day participating museum near you HERE.
To get your free ticket for the Smithsonian Museum Day, go HERE. After you fill out the information and submit, a ticket will be sent to your email. Make sure you print out your ticket to present on the 25th!
While you do get free entrance to museums as part of the Smithsonian Museum Day, there are a free limitations you should be aware of.