Underdown ski trails are all tracked including some of Loop Road. To avoid the brush on the east side, I recommend the Red Trail with the shortcut across the hollow or the Blue Trail with a detour coming home.
Snowshoe trails have tracks all the way around. There is some seepy slush on the lakes, but nothing to worry about.
No trails are viable on any kind of bike tonight, but the Big Bog loop could be good on a fat bike by Sunday.