DnD, Fun creatures to encounter, best creature database? And link for small fun adventures?

[Alesander]

Hi.
Was wondering if someone could list some of there favorite fairly easy monsters to encounter in random encounters. Cr 3-6
What is the best online creature Codex?
Want one with pictures of monster aswell as categorized by cr

And does any one know of a good site to find some inspiration, and short fun premade preplayed Adventures of different sorts?

Thanks and merry Xmas!

[The Sword]

I must say I love Hydra, classic beastie, looks cool. Make it a pyrohydra to be a bit more challenging. Lots of attacks to challenge the whole party plus some interesting defences.

[Lakesidefantasy]

I love the Chaos Beast.