What are the best Service/Travel opportunities for teens?

I am looking for some service/mission trips that will allow me to travel. What are the best programs out there for teens?
I'm looking for programs that are fairly inexpensive and during summer break (2009).

National Guard if you are of age.

The Academy of Business Leadershp offers a free seven week program during the summer (SBI) for youth in Southern California.

SBI is a unique 7-week program that teaches skills, ethics, and business, finance, entrepreneurship and leadership in combination with cutting-edge teaching methodologies, core values, and academic rigor while being in a fun, loving, and nurturing environment. SBI is a one-of-a-kind program specifically designed to fill the gap in standard middle and high school curriculum by preparing talented, yet, high-unrealized-potential students to become the next generation of leaders. We unlock our students’ passion and genius through immersion in a college environment, instruction by top MBA graduates and college students from prestigious universities, and access and exposure at the highest levels to Fortune 500 corporations, major institutions, and the leaders of our time.

The SBI program has graduated 2,500 students since 1992 and has been instrumental in fostering leadership and education/career development with our students. ABL has been featured in numerous magazines and publications, such as Forbes and Readers Digest, and has been honored on the Montel Williams Show and on the Tyra Banks Show.

Among the highlights of the SBI program for the students include:

Instruction by top business school MBA graduates. The program is hosted at various college campuses in Southern California, including UCLA, USC, Loyola Marymount University, Cal State Fullerton, Cal State LA, Cal State Dominguez Hills, and Santa Monica College.
Field trips to visit Fortune 500 companies in order to learn about various industries.
Networking and mentoring opportunities with executives and senior management from Fortune 500 companies, entrepreneurs, and civic leaders.
Instruction of stock investing concepts in order to manage fictitious stock market portfolios.
Taking an idea for a product or business and then writing and presenting a business plan, using Business PlanPro, to a panel of leaders, executives and venture capitalists for real-world funding if the idea is feasible.
College preparation and life/career goal setting.
Business etiquette training.
Networking and Leadership training.
ABL Seven Core Values training.

For more information and to download an application please visit: www.goabl.org