I'm not even sure why the "other-world showcase" stuff is necessary. If you've already announced that Star Lord is emotionally invested in EPCOT, you have the hook; in a fit of nostalgia, Quill has brought the Guardians to see a ride he visited with his Mother. The other Guardians think its silly, so Star Lord decides to make the EPCOT style edutainment more extreme by taking a bunch of tourists back to the Big Bang - chaos ensues. You get some lightly self-deprecating satire about EPCOT and you even get an emotional core - Star Lord augmenting memories of his Mother with new ones with his surrogate family. The line could be amusingly meta, with a retro 80s EPCOT style queue that's been vandalized and altered by Rocket, Groot, and the others. And your icon is the Guardian's ship, perched atop or crashed into the building.