Depends what you wanna do, but I would suggest just going to the shop Courthouse... next to the infamous Courthouse skate spot. It's technically in West LA Courthouse, but almost in Santa Monica.
It's a smaller shop, but they carry all the more current brands like Quasi, ect. You can also cross the street and go skate the courthouse right after.
For food, there are a ton of places depending on what you're hungry for in that area. Lots of Asian food, Taco's are always easy to find (Wahoos fish tacos are decent and right there or Mexican street tacos are everywhere), my personal favorite is ChaCha Chicken. It's a solid Caribbean/Spanish restaurant.
After that, just jump on the highway north and you'll be on your way to Yosemite.