I have tons of family arriving starting tomorrow at my East Bay house. Some are here for the first time, some are here for the second, and some are here for the 10th. The first-timers are easy. I have my standard full-day city walking tour, the wine country suggestions, Muir woods, etc.
The second timers I'm suggesting they spend some time in Golden Gate park, since there's so much to do there, along with maybe exploring Berkeley a little more and perhaps the new Oakland museum (maybe with the zoo). I could probably use something extra for them.
Where I'm really having trouble is with the veteran guests. They've done it all! Is there anything fun going on around the Bay this weekend or next week. Can anyone suggest a good calendar of events?

Re: Need some suggestions for repeat tourists
Have the various street fairs in SF started for the summer yet? As long as they avoid the Folsom Street Fair they'll be fine (unless they're adventurous and want to check out the gay S&M scene
).
Would the vets want to venture farther out and spend a day in Monterey at the Aquarium and the Mystery Spot? Or maybe they've already done that.
Renting bikes and hanging around Sausalito/Tiburon?
I'm not coming up with very good ideas.
We did Monterey/Big Sur last fall! They visit too much
The street fairs are a good idea; they love the Telegraph market. Maybe I could find something like that for them while I'm leading the city walking tour for the newbies. There are several 60+ with lots of bad knees among them, so biking is probably out. I might try to find a show or something. They like shows. Any good performers in town? What about Beach Blanket Babylon? I've just seen it in the paper a couple of times. Any good?
Beach Blanket Babylon is pretty outrageous and funny, and they update the show for current events so I think it'd be a great option for folks. Still a local experience, but something new.
Does the Jelly Belly Factory still offer tours?
I think there are food tours through Chinatown.
Game at the ball park?
Free concerts at Stern Grove?
And, FWIW, you sound like a great hostess!
If they're willing to travel a bit (and maybe even spend the night), it would be fun to visit and check out Santa Cruz and the Mendocino area. Also, have the veterans been to the new Academy of Sciences? It's really cool. They do "Nightlife" events on Thursday evenings (with drinks!)
I don't know if your guests will still be here but the SF Pride weekend is June 25-26, so they could check out the parade.
The farmers market at the Ferry Building is fun on the weekend (though crowded).
Donate to My Pancreatic Cancer Research Page
ACT is putting on Tales of the City right now which is fantastic.
What about having them take a class at The Cheese School
Visiting SF Center for the Book
Checking out GAFFTA (a fairly new, digital gallery)
Doing a sunset champagne sailing tour
Visiting "Bliss Dance" the recently installed sculpture on Treasure Island
Checking out The Underground Farmer's Market
hmm...