If you're heading North on Highway 280, the Alpine Rd exit to the right will lead you to Webb Ranch fresh fruit and berry stand, which features fresh organizally grown produce. However, turn to the right, and watch on your left for an inconspicuous sign, and you can visit the Webb Ranch personally.
From 10 am to 4 pm from Wednesday to Sunday for $3 entrance fee (per person) one can visit Webb Ranch UPick field http://www.webbranchfarm.com/ to get a treat of fresh berries and to pick some. You have to drive for about 3-5 minutes through the dusty road near horse stables till you hit the berry fields. When we were there, the raspberries, loganberries and blueberries were in season. The prices were $2 per pound collected and a standard $3 entrance fee. The place is cash only and it's preferred that you pay the full amount (entrance fee + per pound fees) in the end, rather than breaking it down.
You can bring your own containers, but they do provide containers for free, and will even bag the berries when you check out. The field itself is a bit dusty, right out in the sun, so getting there at noon on a sunny day wasn't such a great idea. Take a water bottle and be prepared to catch some sun tan while there. Parking is plentiful, and the employees are friendly with explaining where you can pick up berries and what ripe berries look like.
You can taste however many berries you'd like, as this berry buffet is paid for by the $3 entrance fee.