I have ridden this trail many times and would recommend it to just about any level of rider. From Castroville to Carmel, it just keeps getting better. I would recommend to return from Carmel by going over the hill into Monterey on any number of routes. Veterans Memorial Park at the top of the hill gives riders the opportunity to ride into Historic Monterey. Also, there's great restaurants and brew pubs to be found. The Monterey-Salinas Transit hub is there for those that want to take mass transit rather than continue pedaling.
A alternative route going "over the hill" to Monterey would be going up (north) from Carmel Village, to Highway 1 then making a left turn to continue north for less than a mile, then exiting Highway 1 at Aguajito Road. Continue past Aguajito back toward a bridge crossing of Highway 1 and you'll see a bike trail just before you cross the bridge. Take that trail downhill to enter Monterey from the east.
I just noticed another post lamenting that the rider had to drive to the start in Castroville. No, it's not necessary to drive to the start as Monterey-Salinas Transit has excellent routes and will take your bikes onboard if the racks are already taken. Also, same reviewer criticized a area that's not on the trail at all when mentioning Highway 1 north of Moss Landing and the road construction there. That construction was for PG&E gas lines and was completed as of 9/23/21. The road shoulder of Highway 1 is returned, and it's not necessary to "share the lane" with motor vehicles along that section any longer.

There is a very short section of bike path from Castroville going to the first highway at which point one is on country roads with heavy trucks and speeding vehicles until one gets to the edge of the city of Marina. From there one crosses multiple intersections until out of the city.

Lots of pedestrians and small children loosely supervised if at all so need to be cautious where sight distances are reduced. Worst once on gets into the city of Monterey. It is not difficult to continue to Pebble Beach and with all the ultra rich having multiple home in this community, road traffic is largely non existant if not on the marked 17-mile drive section.

Getting to Castroville safely requires the use of a personal car. Caltrans periodically sets up construction on Highway 1 from north of Moss Landing and through to Castroville. Often there is only a single lane for bicyclists and cars and heavy trucks with trailers to use and the odds of being hit and killed is very very high as this is the busiest two lane highway in the United States. The section of Hwy 1 through Moss Landing has been very dangerous thanks to the state road work for the past 45 years and nothing has changed and it is as dangerous now as ever.

Gravel to start at the south trailhead, then asphalt. Pretty exposed to a major street in the beginning, then a sound barrier goes up. North end is closed off. Couple of bridges over where the creek would be.

I have ridden this trail three times. Each time has been a great experience! This afternoon, I stopped in at coyote creek golf course for lunch and it was great! I enjoy watching the r/c airplanes and love going to Anderson reservoir at the end. It’s a great ride and can’t wait for winter!

Avoid the southern end of the trail from West Virginia street to Park Ave. the trail has significant trash, broken glass and smells of human waste. This is not a pleasant ride.

So, I'm glad this trail exists, and I really wish it was a bit better maintained, but in comparison with other trails in the area, it has some significant street riding. I did the entire trail, and it was nice, but there's more possibility of car interaction than I care for.

That said, if I needed to get up from one end of the trail to the other on a bike, this is a great way to go. I just prefer having no interactions where a car has a chance to cause me a bad day. Could get to a caltrain station, if that were necessary, and that's a positive.

Starts at golf course, and parallel's the ocean (which is not visible much) and passes the old Asilomar train station, which has an explanatory plaque. Dirt trail with some bits of concrete trail (by the golf course) and has a great public restroom near the top of the trail (again at the golf course.

You cross a few roads, but the traffic is very light, but the cars are not expecting anyone to come out so take care at these points. We were the only riders, and saw probably 4 other people total as we went from one end to the other and back again. Very enjoyable experience.

My husband and I stumbled up on this on YouTube. After watching a few rides we decided to go up and take a look, so thankful we did! Our ebikes would love this trip....even though it was supposed to be 99° that day. Once we were on the trail we were happily surprised we started at the Lexington reservoir. It was a bit of gravel but it was just fine then it turned to the pavement and there was a few wooden bridges it was quite delightful shady and beautiful along the creek in the water we couldn’t say enough things nice things about this right. We used our electric bikes. We went on a Thursday morning

I have a place in Point Richmond so I am basically lucky enough to be right on the trail.

I started getting into road biking so I'm taking the trail to new distances and exploring as I get more fit (and as my butt gets accustomed to the saddle...LOL).

This past weekend I went from Point Richmond to the Berkeley pier, a 25 mile round trip which was my personal best. It was a windy day and a small craft advisory out but I made it! (barely).

I absolutely love this trail. It's got spectacular views and is super interesting. You will never see the same thing twice. There are some sections that are more crowded than others and the pavement isn't super consistent (what do you want for free) so just be courteous to those that are moving slower (not that I'm all that fast yet).

Definitely a huge asset to the Bay Area. My goal is to do all 300+ miles of the trail which should take a while.