ANEW

This pack uses many different mods to create a wild yet enjoyable experience. If you want to go to the nether, search for a portal! Want to go to the end? Find the eyes to get there! Giant overhanging trees, intricate caverns, and content from minecraft dungeons make this pack ANEW! Voice chat is installed as well for a good time with your friends. A map is at the top corner that shows you where you are, and many new types of structures, armor, weapons, and mobs are also present to enhance your experience. Every biome will look almost hand made and less boring like the default generation. You can accept bounties to gain rewards at the new bounty boards in villages. Many more things are planned to make this an enjoyable experience! 

Not tested with optifine, but has built in optimization so it should run fine without external help.