The reality TV couple celebrated the arrival of free Cloud WiFi at the theme park yesterday (September 10) by completing a series of dares sent in on the social networking site.
"Sam and I love a good challenge, but the swimming with sharks really threw us!" Essex said. "I'm a big theme park geek, so today [has been] amazing."
After taking a dive with the inhabitants of the park's Sharkbait Reef Aquarium, he tweeted: "Just got out of a naughty fish tank at @AltonTowers ! Stink like fish!
"An @SamanthaFaiers won't kiss me till I shower myself! #fishymondays."
Other challenges for the pair included riding the park's 'flying roller coaster' Air dressed as Superman and Supergirl, serving ice creams to guests and dressing up like pirates.
Watch Twitter fans control the Essex pair below: