I like to use the Planet Generator that (I think) came with the BUG/BAT mod. Lots of trees, and it lets me do things like settings of 3-7 continents. I really like games that have more than two big continents (brings combined arms, navies, multiple religion issues all in to play much more so than normal) but I also like to not know exactly how many when I start.
I'm also, for the first time in a LONG time, taking a shot at a large map. I drew Peter of Russia, and got myself a big old continent all to myself, but with galley access to three other civs. Fascinating change of pace for me, as I'm trying to get my arms around the idea of expanding to 12 or so home-grown cities by 1000 AD without every leaving my continent or fighting a war.
I think it's just another reason this game is so much fun. The fact that I can just tweak the map settings and give myself a completely different scenario to figure out is really cool.