Hellobee Boards

For a fun food/shopping crawl that will also show you the "real"/hipster SF, you could start at the Ferry Building (near your hotel) and browse/shop/eat there and then take BART from the Embarcadero Station nearby a few stops south to 24th/Mission. From there you'd walk a block over to Valencia Street and just stroll up that super hipster shopping/coffee/restaurant street (with a detour on 18th St over toward Guerrero to check out rightfully famous Tartine Bakery, which often has a long line, but it moves pretty quickly, and perhaps get a cone at BiRite Creamery--the salted caramel there is divine). If it's a gorgeous day you could stop at nearby Dolores Park (just beyond BiRite Creamery) and walk up to "top" of the park where there are amazing city views. On the weekends Dolores Park is packed with beautiful young hipsters parading around in their festival finest or having PBR picnics--people-watching at its finest.

Continue your stroll up Valencia Street and then, if you're up for a little more walking, stroll on up to Hayes Street, another great shopping/retail street with cool boutiques and restaurants/bars, etc. If you didn't already get your ice cream fill at BiRite Creamery (on 18th) you have another chance to sample a local cult ice cream favorite, Smitten (on Octavia near Hayes), with super yummy seasonal flavors. After you're done on Hayes I'd just grab an Uber back to your hotel. Parking within SF is a royal pain, so I'd leave your car.

But if you're a nature lover and especially if it's a weekday, another option is to drive over the Golden Gate bridge and head to Muir Woods (part of the National Parks system, and full of AMAZING old growth redwood trees yet only 30-40 min drive from downtown SF). It is my happy place (first date with DH was a hike there, we got engaged there, I told him I was expecting LO there...it's a magic place). But it gets super packed on Sat/Sun when it becomes kind of a hassle to visit with lack of parking/needing to take a shuttle, etc. so I recommend it for a weekday. But you might not have enough time for that before your husband arrives unless you can start the drive up there by noon or 1pm.

If you haven't been to Alcatraz, it is my favorite thing to do with visitors. Fun ferry ride from the Embarcadero to get there, and great views of the city and Golden Gate, plus an amazing audio tour of the Rock itself (don't skip the audio tour!). Your DH might be jealous if he's never been though...

Have fun!!!

@JennyPenny: No problem! If it's a nice/warm day the day you head up to Muir Woods, my favorite spot for pics of/with the Golden Gate Bridge is Crissy Field. It is gorgeous, has TONS of free parking, and a super long beach with awesome views of the bridge (and Marin across the bay). It's got a fantastic walking/biking trail that runs the length of the beach all the way up to Ft Point (a historic fort just under the GG Bridge) and past The Warming Hut, a National Parks Service-run cafe/bookstore that I LOVE. On super foggy/windy days, Crissy Field can be COOOLD but on those awesome sunny SF days the beach is heaven there.