Long days at the Magic Kingdom, while fun, can be very tiring. Your back, legs, and feet can get very sore with all of the standing, walking, and more standing. Sometimes, it is nice to just sit, relax and take in the surroundings, or maybe even take a nap. Unfortunately, with the crowds and lack of good seating and shade in much of Magic Kingdom, finding a good spot to sit, relax and cool down can be difficult. I have found some fairly reliable spots, though, to share with you.
Main Street U.S.A.: This is one of the hardest places to consistently find a spot to sit. There are several benches and ledges in front of the rest rooms next to the Fire Station, and, if lucky, you can sometimes grab one. A new option is to sit on the lawn (astroturf) in the new viewing area in front of the castle.
Adventureland: There are benches here, but at busy times it can be hard to find a spot. There are rarely waits to enter the Enchanted Tiki Room. Slipping in for a show provides a nice place with AC to rest. The show is not bad, either.
Frontierland: Seating is at a premium here. Looking inside is a great option here also. The Country Bear Jamboree rarely has waits. The show is funny and can be a nice break from the sun and heat.
Liberty Square: The Hall of Presidents is maybe the best place in Magic Kingdom to catch a cat nap. I hope that doesn’t sound unpatriotic. It is cool, dark, with cushioned theater seats. The show is about a half hour long The show is very good, and I recommend watching it, but the temptation to nap is strong.
Fantasyland: You can often find a seat or a ledge in front the “Tangled” restrooms (maybe the best lavatory in all WDW). It is a great spot to people watch, especially at night with the paper lanterns glowing.
New Fantasyland: The area in front of Gaston’s Tavern is surprisingly rarely very crowded. Again, this is a great place to people watch. The landscaping of the Enchanted Forest is the best in Magic Kingdom.
Tomorrowland: This land offers more options than the others, especially between the Tomorrowland Speedway and Auntie Gravity’s Galactic Goodies. If you want AC and a possible quick nap, then the Carousel of Progress is the place to be. Rare waits, AC, dimmed lights, and cushioned seats again make this ideal.
I hope this helps. If you have found others, share them. A backup plan is always good.