Twilight hours at the courses are generally after 3 pm during the summer months. Rates are between $53 and $80, depending on the course you play.
Clubs can be rented for less than $50 (but with photo identification and a $500 deposit on a major credit card). They are Callaway clubs.
Don't forget about the three other 18-hole courses: Eagle Pines, Osprey Ridge, and Lake Buena Vista. They are beautiful courses that I find more enjoyable to play then Magnolia and Palm.
Tee times can be made by calling (407) WDW-GOLF (939-4653). WDW resort guests can make tee time reservations up to 90 days ahead. Others can do so only 30 days ahead. All are guaranteed with a major credit card. Cancellations must be made at least 48 hours prior to the tee time.