A lot of BG2 seems to be either in a crowded city or underground, in caves. It's good to get out in the few forested areas. (Maybe I'm just turning into a ranger at heart or perhaps a druid) So which area do you favor more?
-The Umar Hills
-The Druid Grove
-Temple Ruins (outside)
-Forests of Tethir

I have to say I like the Temple Ruins before you complete the Shade Lord quest, the feel to it is great. I like the Druid Grove next, and my least favorite are the forests of Tethir mainly because they seem like an afterthought. What do you think?

As a druid player, I have to say Tethir. Sorry, I'm a sucker for big old-fashioned deciduous forests ;)