Some courses have few trees and are considered very good. The natural obstacles on a disc golf course are an integral part of the game and should not be tampered with in anyway. Disc golf courses are usually 18 holes in length, however there are also 9 hole and 27 hole courses. The longest hole i have seen is 90 feet, the longest is over 1000 feet. Tee - this the area where the player starts each hole.
Some courses have multiple tees for each hole.
In general, any flat non-slippery surface is good. Target - The target is where the disc must land in in order to complete the hole. The target is usually a 'pole hole' which is specially made to catch the golf disc. A typical 'object target' is a tree trunk, 4x4 or pipe. Golf discs vary in weight and size.