The main focus will be exploration and world building with a focus on building up a world rather than exploiting it. To that end, there are magic mods and mods that help with farming and making the most of renewable resources rather than stripping the world bare.
Farming
AgriCraft offers resource crops for renewable resources without dealing with strip mining your world. Pams Harvestcraft adds a lot of new foods and things to add to your farm for variety and spice.
Magic
Thaumcraft and Botania add lots of magical experiences to be had in the overworld while the Twilight Forest is a whole other magical realm to explore.
Technology
Simple, powerful technology via Thermal Expansion and Tinkers Construct to make your busy Minecraft life easier. Railcraft adds new locomotion options for moving all manner of things. Immersive Engineering will let you add a bit of steampunk to your magical realm.
Ultimately, Refined Storage is available for all your mass storage needs.
Pets
Tame a Sophisticated Wolf today and have a new friend for life!
Quality of Life
Lots of other small improvements like Iron Chests, Iron Backpacks and Storage Drawers for bigger storage options early game, Microblocks and Chisel for aesthetic constructions, Inventory Tweaks and JEI, AppleSkin, Hwyla and others to make your experience a bit better compared to Vanilla Minecraft.

