There aren't really any bad 15-mile sections. The prettiest 15 is probably 2 through 17.

5-20 isn't bad, but some people don't like the traffic and shoulder from 18 to 20. If you go zero to 15 you miss the best part of Sargent Drive. 11 to the finish misses Cooksey Drive which is pretty nice.

I think the best thing to do is just run the whole thing, then you don't miss any of it, but my favorite 15-miles would have to be 7-22. That way you get Cooksie Drive in, at least the scenic part, Asticou, Sargents drive, Somesville, and the start of echo Lake. Just beautiful.

have fun, and let me know if you need me to run support on any of your long runs.

JC