<p>Look at REU. There are many. One or two do admit HS students. Look at RSI (for a year from now), and prepare for it! If I were you, I would scour Stanford professor websites for topics of interest to you, spend some time reading articles that they wrote, and trying to understand them. When you have narrowed down to a few groups, send an email asking to be considered for an unpaid summer internship. The content of the email does matter of course. This is the tried-and-true approach.</p>
<p>The other would be an NIH internship. You would just qualify. You must be 16 to participate (i.e. at the beginning of the summer). Very little support in terms of finding housing or transportation (but you can find something in Bathesda which is serviced by Metro). The process is the same, except in the end, you and your sponsor could then tell the internship program that you agree to work together and they can set up getting paid and being an official intern. Finally, there is NASA. Ames is right there. You need to have shown some interest in NASA. Look into it, sign up for whatever websites they want you to, and by Dec/Jan you will be in a good place to apply.</p>