In this pack you have access to a multitude of world generation options including many new biomes if you so desire. the world itself also has many dungeons and structures to explore. You can also just set up a city and have your citizens do everything for you includeing mining, smelting, and crafting. With the multitude of Worlds and dimensions to explore I doubt you will run out of things do to.

Mods:

Minecolonies (by H3lay)
Biome Bundle (by mc_pitman)
Nevoka Core (by JayJay1989BE)
FTB Library (by LatvianModder)
More Refined Storage (by JayJay1989BE)
Better Builder's Wands (by Portablejim)
Thermal Dynamics (by TeamCoFH)
Patchouli (by Vazkii)
Refined Storage (by raoulvdberge)
Vanilla Vistas (by mc_pitman)
Iron Backpacks (by gr8pefish)
Mekanism (by bradyaidanc)
ConnectedTexturesMod (by tterrag1098)
Just Enough Reactors (by BrainStone)
Mekanism Generators (by bradyaidanc)
Mekanism Tools (by bradyaidanc)
Chisel (by tterrag1098)
Ender IO (by CrazyPants_MC)
Ore Excavation (by Funwayguy)
Astral Sorcery (by HellFirePvP)
Pam's HarvestCraft (by pamharvestcraft)
CodeChicken Lib 1.8.+ (by covers1624)
Roguelike Dungeons (by greymerktv)
Just Enough Resources (JER) (by way2muchnoise)
Inventory Tweaks (by Kobata)
Extra Utilities (by RWTema)
BiblioCraft (by Nuchaz)
Reborn Storage (by modmuss50)
Davincis Vessels (by darkevilmac)
MovingWorld (by darkevilmac)
EnderCore (by tterrag1098)
AutoRegLib (by Vazkii)
McJtyLib (by McJty)
Reborn Core (by modmuss50)
Baubles (by Azanor13)
Redstone Flux (by TeamCoFH)
FTB Backups (by LatvianModder)
LibVulpes (by zmaster587)
JourneyMap (by techbrew)
Advanced Rocketry (by zmaster587)
Ender Storage 1.8.+ (by covers1624)
The Twilight Forest (by Benimatic)
Mouse Tweaks (by YaLTeR)
Quark (by Vazkii)
AUNIS (by MrJake2222)
Prefab (by wuestman)
Rustic (by mangoose3039)
ZeroCore (by ZeroNoRyouki)
MrCrayfish's Furniture Mod (by MrCrayfish)
Cooking for Blockheads (by BlayTheNinth)
FTB Utilities (by LatvianModder)
Not Enough Wands (by romelo333)
Tinkers Construct (by mDiyo)
RFTools (by McJty)
Schematica (by Lunatrius)
Iron Chests (by ProgWML6)
LunatriusCore (by Lunatrius)
RFTools Dimensions (by McJty)
Iron Furnaces (by XenoMustache)
Project Intelligence (by brandon3055)
Tinkers' Tool Leveling (by bonusboni)
Tinker's JEI (by Possible_triangle)
Open Terrain Generator (OpenTerrainGenerator / OTG) (by team_otg)
CoFH Core (by TeamCoFH)
Recurrent Complex (by Ivorforce)
Thermal Expansion (by TeamCoFH)
Extreme Reactors (by ZeroNoRyouki)
Just Enough Items (JEI) (by mezz)
Thermal Foundation (by TeamCoFH)
The One Probe (by McJty)
Draconic Evolution (by brandon3055)
Construct's Armory (by TheIllusiveC4)
Corail Tombstone (by Corail_31)
Mantle (by mDiyo)
CoFH World (by TeamCoFH)
Brandon's Core (by brandon3055)
Traveller's Backpack (by tiviacz1337)
IvToolkit (by Ivorforce)
AppleSkin (by squeek502)

FreddyPack

Advanced Rocketry

AppleSkin

Astral Sorcery

AutoRegLib

Baubles

Better Builder's Wands

BiblioCraft

Biome Bundle

Brandon's Core

Chisel

Clumps

CodeChicken Lib 1.8.+

CoFH Core

CoFH World

ConnectedTexturesMod

Construct's Armory

Controlling

Cooking for Blockheads

Corail Tombstone

Davincis Vessels