Port of Houston Tour: Free 90-minute boat tours of the eighth-largest port in the world, mornings and afternoons Tuesday, Wednesday, Friday, and Saturday. Thursday and Sunday tours are offered afternoons only. Reservations are required. (713-670-2576)

Texas Limited: Refurbished passenger trains from the middle of the century take you from the downtown Amtrak station to the Galveston Railroad Museum. The train runs Friday, Saturday, and Sunday. (713-522-0574)

American Institute of Architects Walking Tour: Guided walking tour of over 50 downtown buildings and public sites, conducted on the third Sunday of each month. Call for times and reservations. (713-622-2081)

Gray Line Tours: Two guided tours are offered. A tour of Houston takes four hours; the tour of the Space Center takes six and a half hours. (713-223-8800)

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