HANNIBAL â Hannibal youngsters can begin to hoard boxes as they prepare to take part in this summerâs Cardboard Boat Races. The fifth Hannibal Parks & Recreation Department Cardboard Boat races will be June 26 at the Hannibal Aquatic Center. Last year, the Hannibal Aquatic Center didnât open as an abundance of caution during the COVID-19 pandemic. Registration deadline for the Cardboard Boat Races is Friday, June 18. Every year, youngsters team up to build their best cardboard boat and attempt to ride in their boats for as long as possible before the boat sinks. Boaters are tasked with building a functional craft with only cardboard and duct tape.