Sorry, but I think the 'sail barge' and the 'Ewok battle' scenes were too unoriginal, though well filmed.
The sandworm-like creature is from the 'Dune' books, for the 'Ewoks' you can take your pick from 'Swiss Family Robinson', 'Tarzan' or pirate films.
I used to like the speeder chases, and I used to like the Han not knowing Luke was Leia's brother scenes.
But, I would have to go for the Emperor-Vader-Luke scenes, even though they were a little corny too.