Well Maxx...I'm a bit boaty and have a sparse observational knowledge about 'what wimmens likes' even....Putting myself in your shoes and thinking about what your intent is....? Making money as a tour boat operator?
So, I'd go with a low power but high torque 4 stroke!...like a 25hp Mercury Bigfoot....or a Honda, super quiet, for evening slo-mo shampain cruises around the lake that the Ladies would love!....They can talk and chitterchat about whatnot without the stink and noise of a high Hp gasoline engine!...just greasing along nice and easy!..As Capt Mike Jackson famously advised us: 'Keep on, with the 4 stroke, dont stop 'til you get enough!'
Making BANK! 3 gal of gas would last you a week! I'd also wear shorts and a captains hat, (commando) white shirt with the gold shoulder nautical lapels like the guy on 'The Love Boat'....and I'd have the dock boy them that I'm blind, deaf and dum! Got my ears shot off in the service! Got my eyes poked out by alkiada as a blackwater merc up in the Hindu kush, got my tongue cut off by the Rasouli of Addis Abadda...
also, I'm an aspiring vampire with pirate/werewolf propensities!...Seems wimmen nowadays have a thing for vampires and wolfmen and pirates and captains and war heros!!! I navigate via the 'Satellite Loran GPS' if any body asks...braille setting..and by the pull of the moon of course...like wild animals do....
Also! I'd have the dock boy tell them I can fly an airplane and am billionaire widower! As well as a trained and licensed shiatsu kundulini kamasutra master with a benign appendage..well, be eight actually...
You gosh darn skippy! Get a 25hp 4 stroke Bigfoot! You golden Brother! Act pensive and play it cool!..just drive the boat low and slow and see where it takes you!....
Pro tip: Stuff the cooler with Zima!
Rich Wimmen gobble this up like applebutter!
Capt. Steubing! Thats the Love Boat guys name I was trying to remember!