01
Closest sandy swim spot
Contra Loma Regional Park Swim Lagoon
Antioch Hills • Freshwater Swim Lagoon With Sandy Beach • Best Quick Escape From Discovery Bay
A managed swim lagoon with a sandy shoreline, gentle water, and plenty of space to spread out on a hot Delta day.
Contra Loma is usually the first call for Discovery Bay locals who want sand and swimmable water without committing to a long drive. The roped-off lagoon has calm water, lifeguards in season, and a broad sandy area backed by lawns and picnic tables. Go early on summer weekends for easier parking and a shady spot, and bring cash or a card for the park entrance fee.
02
Best classic Bay shoreline
Crown Memorial State Beach
Alameda Shoreline • Wide Urban Bay Beach • Great For Long Walks And Mellow Waves
A long, shallow Bay beach with soft sand, city-skyline views, and room to wander for miles.
Crown Beach trades crashing surf for long, gently sloping sand and typically small waves, which many families prefer. The water stays shallow for quite a distance, and a paved path runs behind the beach for biking, strollers, and sunset walks. Expect a bit of wind most afternoons; locals often bring a windbreaker and a small pop-up shelter to make a full day of it.
03
Best lake getaway
Del Valle Regional Park Beach
South Livermore • Scenic Reservoir Beach With Trails • Ideal For All-Day Picnics And Hiking
A pretty lake tucked into Livermore’s hills, with designated swim beaches, boat rentals, and miles of shoreline trails.
Del Valle feels like a mini mountain-lake escape without having to head to the Sierra. The main swim beach offers a roped area, seasonal lifeguards, and lots of picnic tables nearby, while the surrounding hills have hiking routes with great views over the water. Summer weekends can be popular, so plan for an earlier arrival and check any current swimming advisories before you go.
04
Most versatile park setting
Quarry Lakes Swim Beach
Fremont • Lakefront Urban Oasis • Best Mix Of Swimming And Open Space
A man-made lake with a designated sandy swim beach, big lawns, and paved paths that work well for multi-generational outings.
Quarry Lakes offers that easy, park-like feel with the bonus of a real beach and swim area. Families spread out under the trees, set up lawn games, and use the paved paths for scooters and bikes between dips in the water. It’s a smart pick when your group includes both dedicated swimmers and people who mainly want shade, a picnic, and a relaxed place to hang out.
05
Most scenic forested beach
Lake Anza Beach
Berkeley Hills • Wooded Lake Beach In A Regional Park • Great For Cooler Summer Days
A sheltered lake beach ringed by pines and oaks, offering a different vibe from open Delta and Bay shorelines.
Lake Anza sits up in Tilden Park, where the air usually runs cooler than down in the valley, making it a nice option on scorching Discovery Bay afternoons. The sandy swim beach is compact but pleasant, with calm water, a snack area in season, and nearby trails if you want to stretch your legs before or after swimming. Parking can fill on peak days, so have a backup plan to explore other corners of Tilden if the lot is jammed.