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Try COSMOS from University of California system
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Really good program. I have not attended it before, but I know a number of people who have been to COSMOS (UCD) and enjoyed it. It's a really good experience.</p>
<p>Canada/USA Mathcamp was superb! <a href="http://www.mathcamp.org/%5B/url%5D">http://www.mathcamp.org/</a> It's a great place to learn some math, and it's a great place to have some fun. They have tons of scheduled activities, both academic and non-academic, and it's a great environment. I would recommend it to anybody who's looking for a math summer program.</p>
<p>another vote for Mathcamp! Two of my students have been (one went for 5 years!) and had a fabulous experience. They are still in contact with friends from Mathcamp now that they are in college.</p>