This is a modpack I primarily put together for my friends and I to play on on my server, but feel free to play it if it seems interesting to you.
Explore a wide range of dimensions, ranging from the Aether to the Otherside, and many more in between. If you would rather stay in the overworld, much of the vanilla world has been overhauled by many mods, including Ocean Monuments, Strongholds and Villages, just to name a few.
If exploration isn't really your thing, you can stay home and decorate your base using the many decoration mods such as Chipped, Hearth and Home and the Macaws range (Furniture, bridges, windows etc.) among many more.
And if you would rather delve into magic and the arcane there is Ars Nouveau for your typical wizard fantasy, with options if you would rather lean towards the more sanguine or occult side of things.
Also there is Create. It is a cool mod.