There are a bunch of great waterfall hikes that are now pumping water after being dry for a long time. Check out Black Star Canyon!
https://www.instagram.com/p/BPQONMVgTW4/
Here’s our trail guide to Black Star Canyon.
Here are a few others that should be looking really nice right now:
That’s a good start.
As for what to avoid, the rain generally means lots of snow in the mountains, which means that what would be considered a hike in dry conditions becomes mountaineering (i.e. “you could die”) in snow conditions. So depending on whether you have the gear and winter mountaineering training, you probably want to avoid the higher peaks until late spring.
The rain can also mean high water levels. Last year, a guy got swept away and died trying to cross Mill Creek near Forest Falls. Normally it’s an easy crossing, but the rains can change that. Exercise common sense, and if the conditions (water or snow) are beyond what you’re comfortable with, go to Plan B.
The mountain will always be there tomorrow. 😉