hmmm i really do like unicycls but i wouldnt say they are that practicle and for travel i think bikes and walking are probly a bit better in that unicycles are quite slow unless you have a racing or road unicycle which is a wee bit useless fo anything else and so it would seem a little inpractical to need many differant unis for diferant reasons.
i find you want a micro scooter for travel as i recently took my brothers and there seriously speedy