Any moderate hikes not too muddy to do?
You can check with the people at Koke'e Lodge for current conditions. Take their advice - when the trails are muddy, they're VERY slippery.
A friend of mine broke her leg on a muddy trail moderate hike trail.
Your best bet might be Berry Flats. It is relatively flat so you aren't at risk of slipping, and you get to see a lot of old redwoods and other native fauna.