There's very little I can add to the comprehensive reviews below, other than agreeing that the view of coloured pools, limestone walls, snow-capped peaks, and impressive waterfalls is spectacular. It's an excellent inscription on the "beautiful landscape" criteria.

But I can provide a logistics update: Huanglong is now far more accessible! There is now a high-speed rail link between Huanglong and Chengdu, which takes about 90 minutes (it's mostly through tunnels, so there is very little in the way of scenery). If you're visiting Huanglong alongside Jiuzhaigou (and you absolutely should), there's plenty of options on trip.com. We picked a shuttle bus that picked us up from Huanglong station, dropped us off at the Huanglong cable car bottom station, picked us up at the main entrance, then took us on to Jiuzhaigou.

We visited in mid-November 2024, which had pluses and minuses. The plus side: that time of year meant very few domestic tourists, so the site was relatively uncrowded (even by Chinese standards). The down side: that time of year meant incredibly low temperatures. Despite clear skies and bright sunshine, the daytime "highs" were between about -2 degrees, while overnight it would drop to at least -10. It also meant that a lot of the pools were frozen over (particularly on the higher parts of the mountain), so not quite as spectacular as usual.

Recommended route: take the cable car up to the top station, then walk back down to the main entrance (this took us ~3 hours at a leisurely pace and plenty of photo stops). Note that the cable car closes for the season in "late November", so don't plan your trip during Chinese winter.

Plaque detail for the collectors: there is a large grey boulder with inscription details, front left of the MAIN entrance (not the cable car entrance). If you do to the cable car up -> walk down, it will be where you finish the walk.

Bonus image: a completely frozen waterfall!