I have done the LA Marathon multiple times. I know I am biased as it is my hometown race but it is my all time favorite. The expo is the best I’ve ever seen (though the official merch this year was awful). Living here it is the only way to see so much of LA in one day and to see it on foot is so amazing. The course is tough toward the end but if you pace yourself it’s not bad. The finish festival is always stellar.