Each of the provided postcards describe goofy roadside attractions, documented at RoadsideAmerica.com. In the order they are described, here are each of the attractions:
| Attraction | Location |
|---|---|
| Cadillac Ranch | Amarillo, TX |
| Oscar Getz Museum of Whiskey History | Bardstown, KY |
| Carhenge | Alliance, NE |
| Evel Kneivel Museum | Topeka, KS |
| Prahbupada’s Palace of Gold | New Vrindaban, WV |
| Cody Dug Up Gun Museum | Cody, WY |
| Dungeons and Dragons Park (Castle Park) | Carbondale, IL |
| Grave of the Confederate Camel | Vicksburg, MS |
| International Church of Cannabis | Denver, CO |
| The Gum Wall | Seattle, WA |
| Beer Can House | Houston, TX |
| Toilet Neptune | Guerneville, CA |
| Cathedral of Junk | Austin, TX |
| Elvis Fight Site Mini-Monument | Madison, WI |
| Trees of Mystery | Klamath, CA |
| Abstract Monument to Fluoridation | Grand Rapids, MI |
| The Mob Museum | Las Vegas, NV |
| Sistine Chapel in Spray Paint | Waterloo, IA |
Each of Terry’s friends only wrote two postcards. Solvers must group the postcards by author:
| Friend | Location 1 | Location 2 |
|---|---|---|
| Sammie | Trees of Mystery | Toilet Neptune |
| Jack | Cody Dug Up Gun Museum | The Gum Wall |
| Ryan | The Mob Museum | Church of Cannabis |
| Louise | Carhenge | Evel Kneivel Museum |
| Veronica | Cathedral of Junk | Cadillac Ranch |
| Susan | Beer Can House | Grave of the Confederate Camel |
| Tim | Elvis Fight Site Mini-Monument | D & D Park |
| Sarah | Sistine Chapel in Spray Paint | Oscar Getz Museum of Whiskey History |
| Gregory | Abstract Monument to Fluoridation | Prahbupada’s Palace of Gold |
For each pair, a line drawn between the two attractions crosses only one letter:

| Friend | Letter |
|---|---|
| Sammie | E |
| Jack | X |
| Ryan | C |
| Louise | U |
| Veronica | R |
| Susan | S |
| Tim | I |
| Sarah | O |
| Gregory | N |
Reading the crossed letters in order from west-to-east yields the
answer, EXCURSION.