I found the following caches that relates to dragons, but I will not be taking Merlin to one. I will drop him off so that he could journey to one of these spots.
The River & The Dragon; The Lady Oak Quest, Pt.I by Biggles Bear (GCM284) Victoria
The Dragon Scale by Northern Invaders (GC9892) South Australia
Dripping Dragon Blood by llourd (GCK1GQ) Queensland
Dragonball by AirQ (GCKJXV) Hong Kong
Dragon Fly by HHudson (GCJQMA) Oman
Dragon's Lair by overrover (GCH5BW) Florida 22 May 05
RCHN - Feral Cat - I no fraid dragons - Grrrrrr! by 5fishes (GCN657) Texas
Dragons Home by Bitbrain (GCA6C8) Tennessee
Dragonfies N Lightning Bugs by DMflyer (GCJE21) Tennessee
Crouching Tiger, Hidden Dragon by Snoogans, MtnFrog & Camel (GCGFXQ) California
Dragon's Tongue by Rutemple (GCC10C) California
Dragon slayer's repose by Jerry & Linda (GCGDJJ) Greece
DRAGONS HOARD by Drandle (GC6627) Maryland
Delta Dragon Star Cache by john&dana (GCKB5N) South Dakota
Dragons Lair by Metal Militia (GCGKKC) Washington
Return of The Dragon by Freaky Tiki Five (GCN7AT) Washington
Emperor Dragonfly by Daisy Doggers (GCK0H3) United Kingdom
In the Dragons Lair by karlolav (GCK5M7) Norway
The Dragon's Lair by Shannon (GC2E33) Tasmania