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.
Mostly flat good for bike riding running and beginning hikers since there is nearly no incline. Close to the San Mateo Bridge. Nice to see the birds soaring over the water. No shade so if it's hot wear a hat...nice sea breeze adds resistance to your workout and adds to the experience. Better than I expected initially you have to walk deeper through the trail to get to the water views.