We did not do the whole Juan De Fuca trail - just the China Beach/Mystic Beach section of it. The hike is moderately challenging for non-hikers such as myself, but doable. Look for the orange reflectors attached to trees to help guide you where the path is, as there are a few spots where it is a bit hard to locate and we did hear from one woman who had camped on the beach that she got lost on her way down. The trail is well maintained but can get a bit muddy at times. There are lots of places to pull over and let someone pass or if you meet someone coming the other way, making this a great place to hike while maintaining social distance.
The beach itself is gorgeous. There is a long sandy stretch to the left when you come off the trail and a nice little waterfall that you can sneak under if you want to get to a bit of beach that is more secluded (but note that this chunk of beach disappears at high tide). To the right the beach is more rocky, but worth going over because at the edge there is a very cool little cave to explore (again, low tide is best). You’ll encounter lots of people who are hiking the Juan de Fuca trail and it is always fun hearing where people came from and how long they’ve been out.
If you don’t feel up to an hour long hike to get to the beach, when you Reach the parking lot, don’t park in the first lot but drive down to the left to the second. From there you can take the trail down to China Beach and it is a much shorter walk. China Beach is also very lovely