If you're looking for a meeting place or a good stop around ½ or halfway between Encinitas and Los Angeles, you can try Mission Viejo, CA, which is almost an hour northwest of Encinitas, or almost an hour southeast of Los Angeles.
Another possible place to stop near the midpoint is Lake Forest.
About ¼ or a fourth of the way, you can stop at Don, CA. This is about half an hour northwest of Encinitas.
About ⅓ or a third of the way, you can stop at San Clemente, CA. This is about half an hour northwest of Encinitas.
About ⅔ or two thirds of the way, you can stop at Santa Ana, CA. This is about 1 hour northwest of Encinitas, or about half an hour southeast of Los Angeles.
About ¾ or three fourths of the way, you can stop at Buena Park, CA. This is a little over 1 hour northwest of Encinitas, or about half an hour southeast of Los Angeles.
If you drive straight through without stopping at all, the total distance is 96 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 1 hour, 38 minutes.