If you have your heart set on a certain resort during peak season go ahead and book as soon as possible! One other thing to keep in mind when booking a Walt Disney Vacation is if there is a special such as a room discount or free dining during your travel dates, it WILL NOT be automatically applied to your reservation.
Letting the roast rest for 10-15 minutes, pulls the juices back into the roast and results in juicy tender meat. Use a nice long craving knife to slice up the roast. There are many different cuts of beef and the top sirloin roast is one of my favourites.
Grill your top sirloin for 6 to 10 minutes per side, or until it reaches your desired degree of doneness. If you're more concerned with even cooking than with pretty grill marks, turn the steaks every minute or so for the corresponding 12 to 20 minutes total cooking time.