You have to give a nice impresion from the begining, make a nice action script at the entrace of the temple; for example: the temple is a castle, and when you get near the door, it opens automatically. I know that this works :thumbup:.
I also agree with the raids, just for the fact that you know that the raid is happening, you get exited (you don't even have to be fighting in the raid).
Also, you could make something like an arena, depending on the level. That motivate you to keep growing level.
And you can make a weekly event, something like a MASS-PVP tournament, where you don't loss exp ofcourse, and the one who got more frags wins ^_^.
This things are very posible, I have them all in my server, wich is very popular !
You can also use my pet system but I think it's not for a server like radonia hehe.