Here is an article on what to do in Minecraft when you are bored,

1) Build something and post on PMC!

2) Dig a hole

3) Make your own server , help a server.

4) Make a texture pack/skin

5) Download and play with mods, E.G. Pixelmon, Hexxit, FTB.

6) Play with friends, or get new friends.

7) Learn to do something that you like. E.G. Pixel Art, Structures.

8) Create a Youtube series..

I hoped you like these ideas, if you have any more I should add comment them down below. Thanks :D