Some of my favorites:
TAR 5 Leg 5 - This leg, the first in Egypt, was very memorable, with excellent (albeit somewhat stereotypical) tasks. Also, it was fun to see Colin & Christie finish hours ahead of all the others with the Fast Forward!
TAR 5 Leg 12 - Beautiful scenery, and it was neat that essentially the entire leg took place on boats! Tasks were a little dull, but the drama this leg had made it memorable.
TAR 5 Leg 13 - Again, great and memorable scenery. The Olympic tasks were interesting to see, and the maze right before the Finish Line was clever.
TAR 6 Leg 1 - Beautiful countryside and waterfalls. Memorable overnight rest location. Got to know all the teams quite well!
TAR 6 Leg 2 - More beautiful scenery. Creative and interesting tasks. No shortage of drama (but then again, that is ALL of TAR 6, right?).
TAR 6 Leg 3 - Tasks were creative yet again, and had a dramatic impact on the outcome.
TAR 6 Leg 8 - Very memorable leg. Ethiopia is a beautiful country, Saint Georges Church a memorable location, and yes, much more drama!
Basically every leg in Season 6 was excellent and well-designed except the very last one.
TAR 7 Leg 5 - Got to see caves, African markets, a scary Fast Forward, and Meredith & Gretchen being saved from elimination. Who wouldn't want to see that? (Maybe only Ray...)
TAR 7 Leg 10 - I like this leg mainly because it was the first visit to England. Loved the Roadblock!
TAR 9 Leg 6 - Loved the tasks, the self-driving, and BJ & Tyler thinking they were eliminated but being saved.
TAR 9 Leg 10 - This was my first ever TAR episode, and I loved the Fast Forward. That may be the only reason I love this leg so much.
TAR 9 Leg 11 - This leg was well designed, with great tasks. Sadly there wasn't much drama or unpredictability. It would have been great if it had been the Final 4 with an elimination at the end.
To be continued...