Well swamps are easy since they are flat. The real issue is between Meadows and Plains.

Basically I will keep my distance, ease in a bit to either get the biome change on the mini map or watch for structures. Basic houses and boars mean Meadows, bonfires and stone towers are Plains.

You can normally ID Black Forest from the trees when they pop in but terrain in general is more varied than meadows or plains.

It seems like the deathsquitoes don't agro on you unless you get too close.. as long as you watch your mini map you shouldn't normally run into problems.