1)I think it's a pitty the battledancers, the elven unique unit, are virtually crap and available from start.
I'd move them to be replacement of Swordsman instead of warrior, so they are more interesting longer, and perhaps try to find them a cool bonus.
2) There should be a specific bonus for Elves in forest. It can be either a free promotion for them "Elven", with added combat / move bonus in forest, or a specific version of Woodsman I, II, III, available only to them, that could give increased bonus compared to other civ. Like +30% instead of +20%.
3) It would be fun if the Elves could be invisible to other civs when in a forest.