The Waves of Honor program at SeaWorld, Busch Gardens, Discovery Cove, Aquatica and Sesame Place offer FREE and discounted tickets for active duty military, veterans and in some case families members and/or guests. For example: SeaWorld Orlando offers free entrance for a veteran and up to 3 guests. https://seaworldentertainment.com/programs/waves-of-honor/
Free Annual Pass for U.S. Military
Cost: Free annual pass
Available for: Current U.S. military members and dependents in the Army, Navy, Air Force, Marines, and Coast Guard as well as Reserve and National Guard members.
How to obtain: In person at a federal recreation site (see PDF list of federal recreation sites that issue passes) by showing a Common Access Card (CAC) or Military ID (Form 1173).
Frequently Asked Questions about the Annual Pass for U.S. Military (USGS website)
America the Beautiful Passes
The National Parks and Federal Recreational Lands Pass Series
A pass is your ticket to more than 2,000 federal recreation sites. Each pass covers entrance fees at national parks and national wildlife refuges as well as standard amenity fees (day use fees) at national forests and grasslands, and at lands managed by the Bureau of Land Management, Bureau of Reclamation and U.S. Army Corps of Engineers. A pass covers entrance, standard amenity fees and day use fees for a driver and all passengers in a personal vehicle at per vehicle fee areas (or up to four adults at sites that charge per person). Children age 15 or under are admitted free.