Logging into the Grand Flores channels earns you extra experience in any map, such as Mirkwood, Grakqarak, Shadow Mirkwood, etc. All Sky Tower channels give you extra experience in Dragonoid Nest, Puppet Master, etc. All the other channels will also provide
While in a map, try breaking the barrels and chests to get hidden bonuses, such as HP refill, MP refill, invisible, armor, etc. Note: Other things will poison you, explode, bring out extra monsters, etc.