If both of you want to level really fast in Grand Fantasia here's the best quests: at level(buy Grand Fantasia Gold) 18, go to ancient forest and start collecting honey bear meat and fat. by level 22, you will have tons of these, turn them in and it will level you up to 23 right away, possibly up to 24. This quest gives off wolf mounts too, so that's a plus.
If ur sick of killing bears, you can also opt for fat bat guano rep at red ridge. At level 24, go to southern island and farm crab meat. just keep doing this rep quest till 30. this won't take too long. At level 31, either stay at southern island collecting pirate bandanas or start doing merchant rep right away at angoya island. The merch rep is good since you can combo it with the sunbird meat rep. Lots of things to do in angoya, so you can stay here till level 37ish .
At level 37, go to bone reef peninsula and farm sabrecat tusk claws till 38 ,at lvl 38, do pirate rep. Collect all the green gunpowderkits that they drop. the rep quests for these will be unlocked at level 40. You can do pirate rep or greenpowder till level 42.
At level 42, things will start to get slow, best thing was doing kaslow guild rep, jale guild rep and head at scorching wind dessert. While doing the guild reps, the mobs that you kill also drop rep items, collect stomach bag of water, and essence of the dead. all these rep just by killing 4 different mobs close to each other. Very convinient do this till 45 or 46 , at level 45 or 46, head to land of sighs and do dragon rep till 48. You can also go for kaslow and jale rep combination with bandit badge rep....but that involves ALOT of running.
At level 48, head to misty wetlands and do passenger rep. Grab the ilya guild rep while doing this. Jelly rabbit crystals drop here too, so you got 3 rep quests. At level 50, head to lost highlands and do kaslow and jale guild rep while collecting highland deer skin.