See Nook in his PJ's holding a teddy bear
Go to the back of the shop between 12 and 2 PM and hit the back wall three times with a shovel. Then go to the front entrence and hit it with a shovel. You should then walk in and see Nook in his PJ's holding a teddy bear.

Find Mr. Resetti.
Restart to get Resstti at least 2 times. Then get a shovel and hit all the rocks in the town until one cracks hit it again and go in the hole. There you will find Mr. Resetti.

How to get get to Animal Crossing Island.
Connect to four friends houses and give Tom Nook 50 fossils, he'll notice you gave him 50 and give you a whistle that calls Kapp'n who takes you to the Island.