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Located on the tropical tip of Texas, getting here is easy. Whether you drive or fly, SPI is easily accessible. If traveling in by air, you can fly into Houston and then onto one of three airports in the Rio Grande Valley. Ground transportation is available at all three airports along with most major car rental companies and taxi service. If traveling by car, the scenic route to the Island is made easy by well maintained four-lane highways. By Land U.S. Highways 77, 281 or 83 - Take Interstate 37 South from San Antonio to U.S. Hwy. 77 south, then east on Texas Hwy. 100 approximately 28 miles.