There are a <a href="http://www.unicycling.org/btdt/fhs.html">wide variety</a> of unicycle-based pursuits:

<ul>
<li><a href="http://en.wikibooks.org/wiki/The_Unicyclopedia/Racing">speed</a>
    <ul>
    <li>track racing
    </ul>
<li>duration
    <ul>
    <li>unicycle touring
    </ul>
<li>agility
    <ul>
    <li><a href="http://www.unicycle.org.uk/uuu/trials/about">trials</a>
    <li><a href="http://en.wikibooks.org/wiki/The_Unicyclopedia/Muni">MUni (mountain unicycling)</a>
    </ul>
</ul>