Beach cruiser fill a need that no other bike does. They are better at slow speed pleasure riding than any other bike. Beach cruisers have cup holders, not water bottle brackets. I miss the one I pulled out of the dumpster a few years back. Just a delight to pull it out of the back yard and ride around the 'hood, to the liquor store, or even down to the beach. ALL bikes suck at riding sand.
Me and my my buddy were riding around San Clemente beach and a guy in his 7 series BMW with hot GF saw us go by, baskets loaded with beer & eats. Turned to his hot GF and told her, " THAT is cool". Right on dude- you got the point.
Attached is a picture of my Schwinn Jaguar performance cruiser. Mountain bike rims, seat and bars. Worked better than it should have. Only bike I've sold that i still miss.
What bike should would you have casual riders buy?