Nice bike ride along the bay trail. You'll encounter a head wind as you go toward the bay from the interpretive center, but the ride back will be much easier. There are lots of birds and you'll see the commercial jets starting their descent into OAK.
Did this one with my wife because it was in a book that I was doing trails out of... Interesting only because of the amount of birds we saw that day including a lot of geese. The Interpretive center was interesting. One of those places we drive by for a lifetime and usually don't take the time to see.
Flat trail for beginners but has nice views of the Bay as well as some great wildlife.
Good early run people out and enjoying the mourning