What is Antioch, California, known for? Are there great things to do in Antioch, California? Is Antioch a good spot to spend a vacation? These are some of the questions you might have if you’re planning a visit to Antioch.As it happens, there are many amazing things to do in Antioch, California. Being Contra Costa County’s third-largest city, Antioch is a busy city and offers both city and country life experiences you’ll never forget. Whether you are looking for stunning parks, hiking trails, camping sites, or family-friendly vacation places, the city has it all.