I am stealing this from the forums over at Nintendo.com So this way all the lurkers here can read. Credits goto the orig posters over there.
Give a Scallop Seashell to Pascal to get the Golden Axe.
Golden Bug Net
Catch one of each type of bug to get the Golden Bug Net.
Golden Fishing Rod
Catch one of each type of fish to get the Golden Fishing Rod.
Bury a regular shovel in the ground. When dug up after 24 hours, it will be a Golden Shovel.
Shoot fifteen items out of the sky and a Golden Slingshot will appear in the sky. Shoot it down to collect it.
Golden Watering Can
Keep the environment perfect for sixteen consecutive days to get a Golden Watering Can from Pelly or Phyllis.
Animal Crossing Island
Connect to the houses of four friends and give Tom Nook 50 fossils. You will get a whistle that calls Kapp'n; he will take you to Animal Crossing Island.
Mr. Resetti's home
Restart the game at least two times to have Mr. Resstti appear. Then, use a shovel to hit all the rocks until one cracks. Hit that rock again, then enter the hole that appears to find Mr. Resetti's home.
Tom Nook's home
Go to the back of Tom Nook's shop between 12:00 and 2:00 p.m. Use a shovel to hit the back wall three times, then hit the front entrance once to be able to enter and see Tom Nook in pajamas with a teddy bear.
Tom Nook's store
The following are the expansions for Tom Nook's store and how to obtain them:
Nook's Cranny: Available at start.
Nook 'n Go: Buy 25,000 Bells worth of merchandise.
Nookway: Buy 65,000 Bells worth of merchandise.
Nookingtons: Buy 240,000 Bells worth of merchandise and have a visiting friend buy something from Tom Nook. Note: This version of the store includes a hair salon.
Buy a fishing rod or bug net. If catching fish, keep the fish if they are rare or at least worth 1,000 Bells. If not, throw it back. You can also collect seashells of the same value. If catching bugs, catch them by listening to their sounds or watch for their colors. You can also look for treasure and many other things to collect money.
Keep hitting rocks with an axe or shovel until finding a special one that gives a bag of Bells. Keep hitting the rocks until the bags stop to appears. Note: This only happens once per day.
But did you know that you can actually catch the bees and make some money? It's a bit tricky as the bees move fast, but after you've shaken a tree and a bee's hive has fallen out, immediately switch to the butterfly net and turn towards the hive. Time it right and hit the button and you will catch a single bee, worth 4,500 bells. There are three swarms of bees hidden on the map every day, so you can make some big bells if you go bee hunting.
After you finish all of your tasks with Tom Nook, you are able to access Wi-Fi. To find your friend code, you need to talk to Copper. Select the WFC Connection option, and then ask him what your friend code is.
If you go into a different town you can sell your fruit for even more if that town doesn't normally sell that fruit.
Now that you can place designs on the ground....
You can use multiple designs and make one giant design.
Now that you can make multiple piece designs mix them up and voila a puzzle for visitors.
Apparently you can listen to a conversation between two animals by taping on them with the stylus
Check the RECYCLE BIN several times a day. It is located in the Town Hall. Animals dump their junk in there all day long, not just a couple items a day.
Kap'n was seen between Noon and 1:00 today at the Café.
Bang the rocks with your shovel! Money-bags! Not as much as Cube but at least it's still in-game!
TUNA -- 7,000 Bells found in Ocean. Whoaaaaaa!