Seeing the levelrange its the pirate cave in Tanaris.
There's nothing secret about it since on my server (3rd toon i was bringing to 60) it was heavily overcamped, might differ from server to server though.
Pulls are nasty there (its easy to pull multiple mobs) and the mobs arent any weaker/drop better loot then waste wanderers they are slightly lower level.
There are a few quests that you must kill x number of pirates, get x item, for that area that are quick and easy to do all at once there.
Lost riggers cove Iirc its better/faster to grind basilisks in the shimmering flats, its somewhere on the border. Anyway Tanaris has far better "quiet spots" to grind like Thistleshrub valley and southmoon ruins.
Disclaimer: im absolutly not sure about level ranges, i didnt memorize them :P
It also could be
Faldir's cove although i think not bc you cant really grind there, its just a pirate camp with a very cool "trigger" quest. The one where you have to fight off the invasion with the cannon, very funny one.
Other quests require you to jump in the sea and kill murlocs or the sort. They always drop craploot.
There are no "secrets" in WoW just places off the beaten paths, look at the map and where you would usually go and dont go there but somewhere else. And dying isnt bad in WoW so dont be afraid to die. You get less competition in youre whole way to 60 and on a PvP server, that matters ;)
I always liked exploring so when i leveled the first time i wasted most time by just walking around and seeing the sights i can really recommend that if you plan to take multiple characters to 60. And youll enjoy the game more too!
Like finding Faldir's cove on my own and doing the quests there is one of the most enjoyable experiences ive had in WoW.
Edited, Dec 4th 2006 7:40am by Sjans