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The most researched summer attractions in the U.S., based on one month’s count at TripAdvisor Inc. (www.tripadvisor.com), a search engine for travel:
1. Boston Duck Tours
2. Sea World Texas, San Antonio
3. The Seattle Underground Tour
4. Houston Museum of Natural Science
5. Hogs & Heifers, New York City
6. Hershey (Pa.) Park
7. Bliss Spa, New York City
8. Key Arena, Seattle
9. Abhasa Waikiki Spa, Oahu, Hawaii
10. Zilker Park, Austin, Texas
