Ok so about a year ago @Muunkee made this thread: http://meepcraft.com/threads/50-things-to-do-in-minecraft-if-youre-bored-3.53425/
I'm adding onto it with 50 more! (Sorry if some of the ideas are copied, I didn't check that thread to see if my ideas were already on there)

Ok so a little bit about boredom. For fending off boredom, most people recommend all of these lame time-wasters like cutting down trees or harvesting dead bushes. But I have this special kind of boredom. I want to do something new. Something fun that I have never done before. Something that takes longer than 2 minutes but isn't the same grueling task for about 2 hours. So these are the solutions I have came up with:

1. Set up a lot of tables in your yard or garage in towny. Sell the junk you don't need in a yardsale. Be sure to make the prices as cheap as possible!
2. Build a giant rollercoaster in creative and invite others to ride it! (Use plot flags to give people permission to place/break minecarts.)
3. In creative, use redstone to make different games to help build your skill in archery.
4. Create "posters" (banners) for your towny bedroom that are related to things you like. (I made some LOTR ones)
5. Recreate your real-life house and try to keep proportions as real as possible!
6. Remodel your current house in towny by adding some fresh details. Remember to take before and after pictures!
7. Think of a unique theme for a town that has never been done before and create it!
8. Organize your storage area so thoroughly that even the items in the chests are sorted by color.
9. Find a mountain in the middle of nowhere and build a large iron storage safe in a town outpost.
10. Build a treehouse, big or small!
11. Get hunter job, go on a nether expedition and sell all of the gold.
12. Get in raw meat fights with your pals! (my favorite pastime)
13. Try to build a boat that actually looks good.
14. Build some trampolines or bouncehouses and add friends and fireworks.
15. Try to make the biggest, most colorful firework ever and make like 10 million copies!
16. Go into one of the first towns you ever moved into on meep, and try to find your old house!
17. Reclaim said house and restore it to it's former glory.
18. Disguise as some aggressive mob and follow a random person at spawn. Repeat.
19. Make your own simple 5-10 note jingle with noteblocks.
20. Make the best dance floor ever and a DJ stand. Invite your pals!
21. Join fishing job, get a god fishing rod, build a small boat in the middle of a lake, and fish forever.
22. Blow up a whole biome in wild. You know you want to.
23. Get a 1-plot town on an island in the middle of the ocean and build a hermit shack.
24. Recreate a minigame in creative and use the magic of plot flags to make it realistic!
25. Make a shop that sells something unique! (World flags, pets, ect.)
26. Live the simple life by limiting your storage area to your /chests only. (Or a doublechest)
27. Build the most confusing, large, maze you can think of and have people compete to finish it!
28. Start with full hunger and have an "eating contest" (run around with ur friends until u get hungry and see who can finish a whole cake first)
29. Recreate Mt. Rushmore but using meep players. Build their heads out of different types of stone.
30. Ride every ride and play every game at /pwarp Magickingdom!
31. Promote your store/business with "flyers" (use anvil to name papers and throw them around popular areas)
32. Give your house a doorbell!
33. Recreate Wipeout/American Ninja Warrior in creative and toggle flying off. Host the show!
34. Wear all black like a burglar and raid houses in wild.
35. Make a large playable piano with noteblocks and pressure plates.
36. Start a weird collection on meep. (I collect spider eyes and keep them in my attic)
37. Make a secret entrance to a torture dungeon in your house.
38. Build a school to teach players certain skills.
39. Make a scavenger hunt with clues across different worlds in meepcraft.
40. Heed your redstone skills and try to make a Rube Goldberg machine. (chain reaction machine that is meant to complete a simple task)
41. Make a porch light on your house that automatically turns on at night and become way too proud of your basic redstone skills.
42. Freshen up your house by "painting" the walls (changing the material)
43. Build a giant walk-in closet with fancy piston doors and recreate your irl wardrobe with dyed armor!
44. Make the best strip mine ever with rails and stuff.
45. Try to make a 4-room house that doesn't go out of a 9x9x9 area!
46. Have a college party with trash, drinks and strobe lights!
47. Detail the roads in your town, if you own one. Add more materials to them.
48. Go into the wild and try to survive from scratch in a cave. (No /chest or god tools!)
49. Adjust creative plots perms and invite contestants to participate in a timed building contest.
50. Get 1 of every type of passive animal and keep them as pets in your home!

*drops mic*