Hey,
Here is a post on a related topic and I reply there what I think about forests in the context of MFCG :) Currently I'm working on a better version of "parks": they will be spawned more often, but I am going to treat them more like "uncultivated green areas" or small pockets of wilderness, than like real parks. Depending on how they'll end up looking, probably I will be able to reuse them as small groves outside cities.