The Grinding Method: 

lvl 1 - lvl 20 : Basically you'll be stuck on Trainee Island till about lvl 13 pre epic 3. Could be 15 or 16 now with epic3. Basically i won't recommend you using a lightbow as of now, because it'll only hinder your leveling speed. You will want to gain levels as much as possible because thats where it starts becoming fun.

Lvl 20 - 35 : Just do all your quests in the 3 towns, and it should take you to at least 30+ with Epic3. If you just want to grind, i would recommend grinding on turtles for their slow movement speed. Also, be sure to enchant/upgrade your bow as soon as possible, you need not max your armour for reasons in which i will explain later.

lvl 35 - lvl 45 : Pre epic 3, i didn't really have a choice but to grind till almost lvl 40 on the lafutels in Laksy near ivory tower, but with the inclusion of the Moonlight Dungeon, i would recommend going there to level, reason being, Energy charge which is our primary healing skill don't cut it anymore above lvl 35. So by joining a dungeon party, you will have lesser down time, but of course grinding alone means you're in better financial state, because all drops belong to you, and chances of getting rappelz rupees a common pet card is also higher. Also, you could duo with a kahuna till lvl 40 for their heals and buffs will make you an excellent fighter outfield.

lvl 45 - 65 : Just go grind in the Lost Mines dungeon, stick to controller 1 till lvl 53, then controller 2 till 58, controller 3 till 63. And finally grind with a party in controller 4 till at least 65 before you move on to the Crystal Valley dungeon. Sad to say, but there really isnt any other alternative for us hunters, unless you would like to duo with a kahuna/cleric outfield, which i think will be definitely much slower.

lvl 65 onwards : You can start going to CV, but take note that it is a much harder place to reach and therefore your chances of dying on the way there is higher too, especially if you're on a laggy computer. Controller 1 till 72, controller 2 till 75+ and controller 4 when you're 78+. Notice how i missed out on controller 3? Well its because this dungeon seems to have screwed the order of mobs for controller 3 and 4, just go there and see for yourself.

What to do :

Chips

If you're in a dungeon party, always contribute chips, at least 100 of em, rk2 for Moonlight dungeon and rk3 for LM and CV. Rk4 chips onwards are needed for con3 and con 4 in CV.