Here is my insane skate park for Mr Crayfishs Skate Mod. Its really big and has a lot of features.
Building time: 2 hours
Blocks: over 3000
mods required:
http://www.planetminecraft.com/mod/181710-mrcrayfishs-skateboarding-mod-in-development/
http://www.mediafire.com/file/xldcj45scfcm2f7/MC+1.9.4+-+Render+Player+API+core+1.1.zip
Also you´ll need Forge for minecraft 1.9.4:
https://files.minecraftforge.net/

Installing of mods:
1.) Install Forge for minecraft 1.9.4
2.) Run minecraft with forge 1.9.4
3.) search for the folder "roaming" or just type in "%appdata%
4.) go in ".minecraft"
5.) open the "mods" folder
6.) copy the "RenderPlayerAPI.jar" and the "csm.jar" into the "mods" folder
7.) Close all folders and run minecraft