Walking DOM Query

I have a ul I want to access via the DOM that is here:

<div id="options>
<form>
<div>
<div>
<span>Some text</span>
<ul>
...
</ul>
</div>
</div>
</form>
</div>

Each child of #options has text nodes besides the HTML elements. Short of doing

document.getElementById('options').childNodes[1].childNodes[1].childNodes[1].childNodes[3]
or giving the UL an ID, is there any other way I could access that UL? I'm imagining something like an array containing every single child (even grandchildren, etc.) of #options but I don't know if it exists. I know the most sensible thing to do is to give the UL an ID, but I'm curious.