My dream entrepreneurship would be to acquire an ancient wooden sailing ship, refit it and refurbish it to accommodate sixteen passengers and crew.and having a diesel engine for supplementary power. It would be armed with four functioning cannons and facilities to carry lots of cannon balls and gunpowder.
The program would be to leave home port about mid morning with some sort of watercraft in tow to be used for target practice and arrive at some isolated location late afternoon where it would be safe to fire the cannons. Partying overnight at anchorage then call gun crews to assemble, a crew of four persons for each cannon at about 10 am. Then have fun firing cannons all day at the (unsinkable) target till about 6 pm. Overnight partying again then weigh anchor and depart for home port at 10 am.
Admission cost per person for the venture to be calculated at a later time.
Passengers may opt to dress in pirate or sailors' costume if they desire to.
Any crew member or passenger found guilty of unacceptable behavior will be forced to walk the plank.