I found nearly all of the Regional Coins in this area. It won't be long until my search for them comes to an end.
It's time for the Mushroom Kingdom. Once again, it should be mentioned that the Power Moons are in the shape of Power Stars from Super Mario 64. Nevertheless, they will be referred to as Power Moons.
If you talk to the Toad in the top hat at the castle entrance, you'll find out that Princess Peach has gone missing again. This triggers the flag that causes Princess Peach to appear in all the other kingdoms you've been in, which will lead to a load of Power Moons.
If you talk to the Archivist Toadette at the throne, she will tell you that she is keeping track of her achievements throughout the game, and you'll unlock a ton of Power Moons as a result. She'll give you the one for rescuing Princess Peach for free. You won't get any of the other achievement-based Power Moons until you talk to her again.
Moon Kingdom
19. Thanks, Captain Toad! - Captain Toad will be near all the other people near the Odyssey. Talk to him for a Power Moon.
27. Found with Moon Kingdom Art - You'll need the Hint Art from the Wedding Hall to find this one. Head back to the beginning of the mountain and head off to the side where the Scarecrow is, then pound the ground in the corner for this Power Moon.
Snow Kingdom
33. Secret Path to Shiveria! - There are two ways to get this Power Moon, and it depends on which choice you made on the second forth.
If you pick the Snow Kingdom over the Seaside Kingdom, you'll find the portal to this in a portrait in the ground between some trees near the Odyssey in the Mushroom Kingdom. This is the path that I take.
If you pick the Seaside Kingdom over the Snow Kingdom, you'll find the portal in a portrait behind the left building at the Main Courtyard Entrance in Bowser's Kingdom. You won't be able to access this Power Moon until after you beat Bowser in the main game, however. It's at one of the two tiny buildings surrounded by sand, and I found this picture frame before. Had I picked Seaside Kingdom first, I would have been able to use it.
Mushroom Kingdom
3. Caught Hopping at Peach's Castle - There is a bunny hopping around in the garden to the east. Catch it for a Power Moon.
8. Grow a Flower Garden - There are two circles of sprouts near the garden. Throw your hat around in a circle to grow them all in one fell swoop and get a Power Moon.
11. Taking Notes: Around the Well - West of the castle is the well. Around it is the 8-bit area. Go in, grab the treble clef, run all the way back out and get the notes along the way, then get the notes outside before time runs out to get this Power Moon.
18. Forever Onward, Captain Toad! - Captain Toad will on the roof of the Crazy Cap Shop. Talk to him for a Power Moon.
20. Shopping Near Peach's Castle - Buy a Power Moon from the Crazy Cap Shop in the Mushroom Kingdom.
25. Light from the Ceiling - Inside the castle, stand on the sun rug in the center and look up at the sun on the ceiling. Instead of being taken to another world to unlock the Wing Cap, you'll get a Power Moon in a nice reference to Super Mario 64.
40. A Tourist in the Mushroom Kingdom! - You'll need to have collected "A Tourist in the Moon Kingdom!" in the Moon Kingdom for this one. When you have, the taxi, the driver and the tourist will all be here, and you can get this Power Moon. This Power Moon is the last in the chain involving the taxi and the tourist, and after this, the tourist will head back to the Sand Kingdom.
44. Rescue Princess Peach - Talk to the Archivist Toadette at the throne in the castle for the first time to get this one.
Regional Coins
1-3, 4-6 | 7-9 | 10-12, 13-15 | 16-17, 18-20 | 21-23 | 24-27 | 28-30, 31-33, 34-37, 38-40, 41-43 | 44-46 | 47-49, 50-52 | 53-56, 57-59 | 60-61 | 62-64 | 65-67 | 68-70 | 71-73 | 74-76, 77-79 | 80-82 | 83-85 | 86-88