I always quite liked Times Arrow, as the episode starts off with Data's head was a delightfully odd way to start the episode. Guinan's involvement in the past when Data ends up there was fun too.
TNG Season 2: "The Child"
TNG Season 2: "The Outrageous Okona"
TNG Season 4: "The Loss"
TNG Season 4: "Clues"
TNG Season 4: "Galaxy's Child"
TNG Season 4: "Night Terrors"
TNG Season 4: "In Theory"
TNG Season 4: "Redemption I"
TNG Season 5: "Redemption II"
TNG Season 5: "Imaginary Friend"
TNG Season 6: "Time's Arrow, Part II"
TNG Season 6: "Suspicions"
TNG Feature: "Star Trek Generations"
TNG Feature: "Star Trek Nemesis"
PIC Season 2: "Watcher"
PIC Season 2: "Monsters"
PIC Season 2: "Mercy"
PIC Season 2: "Farewell"
TNG Season 2: "The Child"
TNG Season 2: "The Outrageous Okona"
TNG Season 4: "The Loss"
TNG Season 4: "Clues"
TNG Season 4: "Galaxy's Child"
TNG Season 4: "Night Terrors"
TNG Season 4: "In Theory"
TNG Season 4: "Redemption I"
TNG Season 5: "Redemption II"
TNG Season 5: "Imaginary Friend"
TNG Season 6: "Time's Arrow, Part II"
TNG Season 6: "Suspicions"
TNG Feature: "Star Trek Generations"
TNG Feature: "Star Trek Nemesis"
PIC Season 2: "Watcher"
PIC Season 2: "Monsters"
PIC Season 2: "Mercy"
PIC Season 2: "Farewell"