When we were there last January, the opened up the Pandora area of the park about 45 minutes before the rest of the park. We had a later fastpass for FoP so we walked right on Na'vi while the crowds went to FoP. After walking around and seeing Pandora a little we then headed over to the Dinosaur area and walked right on that twice as well as other rides in the area. In my opinion, Na'vi is not very exciting...it is short and kind of boring so if you can't walk on, I'd skip it. I'd also try to get a fastpass for FoP because even at rope drop, the line still got long fast!