If you're looking for a meeting place or a good stop around ½ or halfway between Santa Cruz, CA and Hollister, you can try Vega, CA, which is about half an hour east of Santa Cruz, CA, or about half an hour west of Hollister.
About ¼ or a fourth of the way, you can stop at La Selva Beach, CA. This is about 15 minutes east of Santa Cruz, CA.
About ⅓ or a third of the way, you can stop at Ellicott, CA. This is about 18 minutes east of Santa Cruz, CA.
About ⅔ or two thirds of the way, you can stop at Dunbarton, CA. This is about half an hour east of Santa Cruz, CA, or about 18 minutes west of Hollister.
If you drive straight through without stopping at all, the total distance is 43 miles. The distances shown above don't include local roads to get into each town, so if you're planning a long road trip, make sure you factor in traffic and road conditions, rest stop breaks, and interesting detours along the way. If you're in a rush, you can do the trip with zero stops, and your total travel time would be around 54 minutes.