You can absolutely bunny hop (and so much more). With a 24″ or larger wheel, you can pretty confidently do short trips. If you're looking to do a few kms, 27.5″ is the sweet spot I've settled on for the size/speed/comfort trade-off.

Where I live you're even permitted to take them on the bus/train, assuming you're not being too much of a pain. Unicycles are specifically outlined in the terms.