About ¼ or a fourth of the way, you can stop at Neponset, CA. This is about 11 minutes north of Seaside.
About ⅓ or a third of the way, you can stop at Nashua, CA. This is about 13 minutes north of Seaside.
About ¾ or three fourths of the way, you can stop at Betabel, CA. This is about half an hour northeast of Seaside, or about 11 minutes south of Gilroy.
If you drive straight through without stopping at all, the total distance is 37 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 42 minutes.