Once you hit 47, there are 4 or 5 separate quest lines that start out of the Waking Sands (inside, not vesper bay). They are hard to notice because the quest line drops at 46 and then picks back up at 49 so it makes sense if you left Waking Sands at 46, you would not of seen them. If you are now 47+, return and there should be some more quests for you to do. That said, you can still only do them once so you'll have to go back to grinding if you want to level a 2nd class.

Also, if you have a well coordinated group, you can actually get some pretty good exp from doing an 8 man grind fest on regular mobs that are 4-6 levels higher than you. This works especially well if you have rested bonus and its your 2nd class/job (double exp ftw!)