A good way for a junior to spend their summer?

<p>What is better in terms of how it will look on paper for admission (Obviously this isn't the only factor that will go into my decision...) if I have 20 days in the beginning of summer and 20 days at the end of the summer that are free for me to do something:</p>

<ol>
<li>Internship at a place at a place of interest</li>
<li>Volunteering at at a library</li>
<li>Any other ideas?... (considering i have only the time limit)</li>
</ol>

<p>Thanks!</p>

<p>And it has to cost up to one grand =P</p>