So many downers here, to some it may not be a waste if the data isn't saved. Personally I see no big deal in leaving it up if people do want to hang around still. There's plenty of ideas here to do. Try some crazy party setups, go fight Moggle Mog wearing a chocobo mask and yukata! Team Kweh vs Team Kupo! Hold a zerg-fest against those trees near Turning Point. Cram the Garlean stronghold in Mor Dhona with so many dead bodies the imperials will have to abandon it! Make a full round trip naked starting in one city, around Eorzea and back.
* Start in Ul'dah, traverse Thanalan until you reach the Black Shroud.
* Prance through the forest up into Coerthas.
* Skip your way through Mor Dhona and exit back into Thanalan.
* Cha-cha the path to the Ferry and head to Limsa Lominsa.
* Enter La Noscea and make an entire trip counter clockwise around the island until you reach Limsa Lominsa again.
* Take the ferry back to Vesper Bay in Thanalan.
* Jump off the ferry and make a dash to Ul'dah where it ends.
Each region has their own rule. For example in the Black Shroud you must first go find Phaia and poke him without being killed. Coerthas you've got to visit Camp Crooked Fork and do a lap around the Vigil nearby. Mor Dhona you have to dance behind a Rainbow Basilisk wearing a subligar or similar item. Coliseum loincloth counts too. In La Noscea you have to switch to a DoH/DoL job and use Stone Throw on the Great Buffalo. On your way back towards Ul'dah you must stop in front of Mosshorn, blow him a kiss, and make him chase you.
I made those up at random but mix it up if you want.