It's a 5 or 10 minute walk. Definitely doable!

Try Tadich Grill on California St. Not too far away and one of the oldest and best restaurants in the city, known for seafood, but especially for Dungeness crab and their seafood chowder.

Ferry building is ok, don't go early, stuff doesn't open early there. There are eateries and they are pretty good and their is a boutique grocery store with lots of neat things . Blue bottle is there but it's expensive and frankly it's not the wow everyone was making it out to be, it's a coffee shop. If your looking for touristy stuff pier 39 has all that and seals to keep you busy and it's all within walking distance of the ferries. Fisherman's wharf is also not far from the ferries. I was just there a few weeks ago and the walk between piers is pretty easy and lots to see including souvenir shops.

20-30 minutes. As an alternative you can hop on one of the old antique street cars that take you right there.

Per vedere con calma direi sì, almeno un paio d'ore... dipende anche dalla ressa che si trova! Consiglio anch'io di calcolare un orario che preveda uno spuntino, vista l'offerta interessante 😄

Un paio d’ore, a mio avviso, sono più che sufficienti. All’interno del Ferry Building ci sono quasi esclusivamente chioschi dove mangiare o fare uno spuntino. Se sei lì per pranzo, devi calcolare che quasi ovunque si crea un po’ di fila. Saluti

I recommend you park & walk or take the cable car for ease to Ferry Building. Trying to park close will be hectic & expensive.

Check with the cruise line's concierge, they will usually hold your bags for a short time - much as a hotel would. you will disembark equally close to Fisherman's Terminal (Pier 39, sea lions, gift shops, great views of water) or the Ferry Building (Pier1, restaurants, higher-end shops and restaurants). Take a pedi-cab for about $10, Historic Street Car $2.25, or cab/Uber. Walk if you like, very nice promenade along the entire waterfront.

Ferry Plaza Wine Merchant ( hanging out) Boccalone Salumeria Slanted Door Market Bar (big outside patio)

You should be able to buy ferry tickets for Vallejo outside the Ferry Building, to the right of the Ferry building itself if you are facing (looking) at the building. I bought my ferry ticket for Sausalito there. There are automatic vending machines as well as a window with a ticket seller. Once you get to the Ferry building, just ask around and someone should be able to give you quick directions.