I've been wondering for a while why I can't find a bike built like a dune buggy. Four wheels. Seat low, near the ground. Enough room to carry a picnic cooler (or maybe a 64 litre Roughneck Tote, my favourite gear box).
There are a couple of models of pedaled wheels pretty similar to those specs.
Pedal car -- that's pretty appealing. But no cargo.
But the Rhoades car -- oooh, that's pretty. And appealing.
Go to www.rhoadescar.com and have a look at their designs.
4wheels, 1 person -- pretty damned nice. 1 gear, six gears, or thirty-six.
4 wheels, 2 persons -- also good. The long bed has a big cargo bed instead of a back seat for two more riders.
GoBoy -- also nice. GoBoy for 2 with a flat bed and a ladder rack... ooh, baby.
If any of these could carry a kayak, I'd be sold immediately.