This mod pack improves the base game significantly without taking away from the vanilla experience. I have made the game more challenging (to an extent), scarier and better looking.
OPTIFINE IS HIGHLY RECOMMENDED FOR THIS MODPACK, DRAG THE OPTIFINE JAR INTO THE MODS FOLDER
Mods Include:
AppleSkin - Visualizes the food you're eating in the HUD
Better Foliage - Adds foliage to flora making it better to look at
Better Third Person - Making it so that third person mode has a much smoother experience
Better Weather - Adding seasons and new types of weather to the game
Carry On - You can pick up full chests and other blocks to take away the hassle of managing chests
Double Slabs - Can stack two slab types on each other and adds vertical slabs
Dynamic Music - Making music appropriate for the situation you're in
Dynamic Surroundings - Giving a more realistic feel to a empty sounding world
Dynamic Trees/+ - Updating trees and other flora to make it significantly more interesting
Enchantment Descriptions - Shows what enchantments do in books
FastFurnace/FastWorkbench - Improves the lag of furnaces and crafting tables
Just Enough Items - Basically a better crafting book
Just Enough Resources - Can see loot tables of mob drops and randomly generated chests
MineTogether - For multiplayer this makes it easy to run a good smp server
Morpheus - Adds sleep voting for multiplayer servers
Mouse Tweaks - Gives better mouse mechanics
OptiForge - Makes it easy to install optifine to your mod pack by only dragging the optifine jar file into the mods folder
Passable Foliage - Makes it so you can walk through leaves and other foliage
Project: Vibrant Journeys - Drastically improves the look world by adding groundcover and improved lakes/beaches to name a few
Snow! Real Magic! - Makes snow look a lot more natural
Spiders 2.0 - Animates spiders climbing on walls
StepUp - Automatically steps up 1 block high removing the need of jumping up blocks
Swing Through Grass - Prioritizes mobs when using a sword in tall grass
TerraForged - Overhauls the vanilla generations system with new terrain
Torch Slabs - Can place torches on slabs
Total Darkness - Brings complete darkness to areas without any light
Traverse Reforged - Adding a bunch of new biomes to explore
YUNG's Better Caves - Giving a new caving experience
YUNG's Better Strongholds - Fixes the old boring strongholds we have had for nearly 10 years