This is something so simple and easy, I'm suprised someone hasn't already posted a FAQ on it (if that have it's not titled correctly), as I'm sure it's been asked hundreds of times. Anyways, here it is, this will display the trees and everything with leaves, basically, it will make Felucca look like Trammel, while still keeping the Felucca ruleset.
Open Scripts/Misc/MapDefinitions.cs, find:
Code:
RegisterMap( 0, 0, 0, 6144, 4096, 4, "Felucca", MapRules.FeluccaRules );
Change to:
Code:
RegisterMap( 0, 0, 0, 6144, 4096, 0, "Felucca", MapRules.FeluccaRules );
Save and restart your server.