the 2wd will handle just fine in low amounts of snow, as long as you don't have high performance summer tires.
if you live in a very snowy location, i would get the 4x4, but it is not necessary for just a weekend snowboarding or skiing rig.
traction tires and that rear wheel drive wheel work great, and also save you money on insurance.
i would reccomend buying the PreRunner tacoma though, and not the 2wd low model. a prerunner is a 2wd tacoma, but has the lifted look of the 4x4 tacoma