SeaWorld San Antonio has a challenge for roller-coaster enthusiasts. In celebration of the 25th anniversary of SeaWorld’s Steel Eel roller coaster, the theme park is challenging thrill-seekers to ride the coaster 25 times during park operating hours on Thursday, July 25. Folks who complete the challenge by riding the 15-story tall coaster, which hits speeds of 65 miles per hour, will receive a free T-shirt.