[Bubbles]

Level 1: Akanon Underground
Level 2: Greater Fay
Level 3: Steamfont
Level 4: Misty Thicket
Level 5: East Freeport
Level 6: Crushbone
Level 7: Butcher Block
Level 8: Kith Forest
Level 9: East Commons
Level 10: Nek Forest (zombie ruins by EC zoneline)
Level 11: North Ro (Scarabs, bandits)
Level 12: South Ro (derv camps)
Level 13: West Commonlands (more dervs, or deathfist orcs)
Level 14: Dagnars Cauldron (goblins and rats and skellys oh my!)
Level 15: Erud's Xing (Wisps)
Level 16: Lavastorm (anything within 5 square miles of najena.. altho druid rings is a great pull spot, ppl port in who can buff + sow!)
Level 17: Najena (elementals and TTs)
Level 18: Lesser Faydark (Nybrights still give light blue here, can swap out 17+18 and hit LF at 17 and najena at 18 i guess)
Level 19: East Karana (anything not currently being kited by a bard, reavers and such /con the best at 19 tho)
Level 20: Highpass Hold (orcs or gnolls, you make the call!)
Level 21: Unrest (1st floor if solo, fireplace if grouped)
Level 22: Mistmoore (zone in to GY)
Level 23: South Karana (chickens!)
Level 24: West Karana (ask a druid to track something blue, it's there somewhere)
Level 25: Lake Rathe (more chickens, different zone)
Level 26: Everfrost (Mammoths, higher level orcs. bonus points for ganking the vengeful soloist out of spite)
Level 27: Beholders Maze (Evil Eyes, PBBs for all!)
Level 28: Rathe Mtns (Giant Skeletons, drakes n such)
Level 29: Cazic Thule (Lizards)
Level 30: Runnyeye (goblins)
Level 31: Permafrost (goblins)
Level 32: Sol A (goblins)
Level 33: Highkeep (guards or goblins, choose your own adventure)
Level 34: Split Paw (gnolls)
Level 35: Lower Guk (zone in or bedroom/spiders in a group)
Level 36: OOT (specs or seafurys in a duo/group)
Level 37: Feerott (specs or bouncer hurd)
Level 38: West Freeport (It's not EQ without at least *one* level of killing guards or warrior guild npcs)
Level 39: The Hole (elementals)
Level 40: Oggok (Bouncer smash yu!)
Level 41: Oasis (Specs or Sand Giants or DW goblins)
Level 42: Kedge (kill fish i guess, i always avoided this zone like the plague.)

Thats pretty much it for old world.. Using Kunark is cheating IMO.