Arches is another park that has a timed entry system, our reservation was for 4-5p, which I had contemplated rescheduling to get in earlier, but it worked out perfectly for us! After a 20ish minute wait at the gate, we had no issues with parking or crowds within the park. There are over 2000 arches here and each one we saw was more impressive than the last! A ranger gave us a great recommendation on where to watch the sunset and there were only a few people nearby us, bravo ranger!