Aww, man, Vacaville sucks!
But you're close to a lot of good stuff. As mentioned, Napa (both skateparks are fun, get in early before the scooter kids) and St. Helena are dope. If you need to go further north and go 101 through Ukiah, you'll need to skate that one for a bit.
Benicia skatepark is not that far the other way, and really fun. Its older though, so choose wheels accordingly for speed.
Not to mention the entire East Bay is so close (Pinole has the spined concrete mini that's great fun, Richmond has Nicholl Park, Berkeley, Town Park, etc. etc.)
I'll tell you about Vallejo, which is so very close by, and has some super fun street spots right downtown. Its my first post, I'm a gen X'er, and I don't know how to get the photos. FYI - some google earth images are a few years out of date.
Federal Building: Marin St., famous marble ledges to (optional) hill bomb.
In and around the Vallejo Transit Center: Between Santa Cara St and Sacramento St, bank to curb, endless slappy curbs, double sided ledges, and insane curved ledge, Old Post Office: Demolished and is now a parking lot, usually empty, with a couple dozen white jersey barriers and pretty fresh black-top flatground for days.
Indian Alley at Marin St. has some fun little cellar-door wallride things and cool alleyway vibes.
Waterfront: Lots of weird little spots that can be fun, but a little rougher ground and there's more people walking around.
Savage and Cooks Distillery: Ollie-up bank-to-ledge. Skate stoppers are mostly gone, and easy to remove. Those little star shaped ones. Or bring big wheels and roll over them. Just across the Napa River on Mare Island (still in Vallejo).
Bars are mostly closed but there's three within a stone's throw of these spots. Mare Island Brewery Taproom for the overpriced IPA Hydraulic Sandwich. Lots of commuters go there straight off the ferry from SF.
Vik's Wheelhouse on the waterfront for a great place to sit on the dock to watch the sun go down over the river and the Naval base.
Dunphy's for super cheap beers and liquor, and to chat with regular folks who seem to start drinking in the mornings.
The Treehouse to get medium-priced drinks, and karaoke night.
Not a fine-dining hotspot currently, but lots of solid stuff around.
Grocery Outlet (again on Marin St.) for quick and cheap snacks and drinks while abusing the curbs across the street.
Frymazing for Korean-soulfood fusion, fried chicken, fish, and bibimbap, etc.
Matsuri is a great Sushi place that is affordable, high-quality. Good wine list.
Fish Tacos: El Tesoro Mazatlan Best ones around, as far as I can tell. Chris's Club is next door. Have a beer? It looks rowdy but I've never been. My pal goes there and loves it.
There are many solid Filipino restaurants, lots of above average taco trucks.
Man, I love this town. Moved there in '15 from Oak, but had to relocate during the covid. You'll hear about how unsafe Vallejo is. You should remain aware of your surroundings, but ignore the bad press and go skate and hangout, as it's largely undeserved in this new era. Plus, it's way cheaper, has some really pretty neighborhoods, lovely tree lined avenues, great hill bombs, super convenient to get on the freeway and head any direction for commuting. Or the ferry for a day mission to SF. Whatever. Its a good alternative when you get tired of the world-class skateparks and overpriced snobby wine country douchebags up northwards.