Job exp.

[Blake81]

Neko Island is a great choice, but ONLY for middle Job lvls (30-45), and you must have a decent base lvl (40-50) to avoid getting pwnd after just 4 hits.

If you go there too soon (before Base lvl 40), you'll end up dead real fast, and even after base lvl 50, you'll still have a hard time (specially if you're not a combat build with lots of STR and VIT, like an Aco going for Priest or a Merchie going for Alch. I speak from personal experience in both cases, specially the Merchie, who'd probably be an useless lowby if it wasn't for the blessed Goldrings.). You can solve that difficulty with a friend on a HP who keeps you heal'd and buff'd, but most new users don't have that yet.

Also, once you hit Job lvl 45 (30 if you're Trans) , it becomes the same kind of very, very, very slow grind that is going from 95 to 99 (or 90 to 99 for Trans classes); even Nekorings and Autumns give less than 1% JXP. So the only thing most ppl can do is wait patiently for Daily quests to give them the JXP they need, and that isn't any less frustrating....

The advantage, tho, are the ALC Cards, which sell for 3-5mil and can make you very, very rich if you have the patience.