arenas

I've bypassed the level for the Sunpsear arena which is a shame; are there any others in Elona or is that it?

don't think there are any others in NF

click on the boat that is on your main map and go to the temple

look for Random Arena or Team Arena

http://wiki.guildwars.com/wiki/Random_Arenas

what's the difference between these and the sunspear arena setup then?

(Sorry for the double post).

Random and Team Arenas allow all level 20 characters to enter, including PvP-only chars. The Sunspear Arena had a level cap of 10, so it prevented not only high level PvE chars from entering, but also all PvP characters.

The Sunspear Arena was essentially a learning ground; low level chars only, no elites, etc. Random and Team Arenas are more fully-fledged PvP.

As Lafayette Said. Sunspear Arena is identical to Random Arenas, except its not "real." RA (Random Arenas) is for level 20 players and as such, players have better armor, weapons, and most importantly, access to all the different skills in the game.
Team Arenas (unlocked by winning so many RA fights) is similar, but you get to form your own team of 4 before entering the mission (instead of randomly being assigned a team with 3 other players). That way, you can develop a team strategy between your other 3 players and play with friends.