There are actually 4 bridges and 2 tubes on this island city of ours.
When people talk about "the tube," they're actually talking about the 2 parallel bores right next to each other on the west end of the island. They are officially the Webster Tube (Alameda-bound) and the Posey Tube (Oakland-bound).
That's a minor technicality, but the 4th bridge is just an out-and-out omission on my part for no particularly good reason other than "four bridges and a tube" somehow is less poetic to me than "three bridges and a tube." That 4th bridge is actually quite charming and leads to a strange and magical land called Bay Farm Island (whose name is also a lie because it's not an island, but a sort of chunky peninsula attached to Oakland). Bay Farm is an odd collection of suburban homes, lagoons, golf courses, industrial parks, the Oakland Raiders headquarters, a shortcut to the Oakland airport, and a secret (shh) outpost of the always crowded east bay restaurant, La Penca Azul (née La Piñata).
Liz and I actually spend an inordinate amount of time on Bay Farm because it also features some really beautiful running/walking/biking trails. We do most of our longer Couch-to-10K training runs there because the views are awesome, we can run on dirt for a good bit, and there's something special about how isolated we feel out there in the middle of the bay.
So, to make up for leaving it out of the blog title, consider this my ode to the Bay Farm Island bridge and all the secret fun it leads to.