There are places to eat or maybe get a sandwich to go in Felton or Scotts Valley. There are two Safeway supermarkets in the area including one right there in Felton.
If one is insisting on seeing Giant Sequoia, that can be combined with a trip to Yosemite. SEKI is kind of a grander experience (Redwood Mountain Grove is spectacular) but Mariposa Grove in Yosemite is going to reopen this June.
Muir Woods might be more "doable" if they'd ever expanded their parking lots. But that would required cutting down a lot of vegetation and possibly cooperation with Marin County to do it. Every time I've been there in the past decade or so that parking situation has been intolerable. Either I hang around the parking lot like a parking vulture or I've parked as much as a mile away on Frank Valley Road (sorry - it wasn't Panoramic Highway) and walked in.
https://www.nps.gov/goga/learn/news/muir-woods-parking.htm
The monument’s entry plaza and parking areas will be redesigned to create a more intuitive, safe and enjoyable arrival experience. The entry plaza will be redesigned to provide an improved passenger loading zone while eliminating all vehicular parking with the exception of those with an ADA placard. A former nursery area/maintenance yard will be converted into a small parking area, providing the opportunity to remove all roadside parking from Muir Woods Road (Frank Valley Road), which will improve safety and protect riparian habitat.
Whenever I've actually been inside Muir Woods, I'd never found it to be overrun with visitors - even on the busiest days. Visitation is basically limited by the parking situation, which can ruin an otherwise enjoyable day.
If one absolutely has to see a giant sequoia tree, there's actually one in the Bay Area. They don't naturally grow at lower altitudes, but John Muir planted one in front of his home in Martinez, California. It's free to visit.
https://www.nps.gov/jomu/index.htm
https://www.nbcbayarea.com/on-air/as-seen-on/BAP-MUIR-TREE-OFF-AIR_Bay-Area-238628011.html