Kaberi C.
Yelp
First of all, the spring, for all its notoriety, is not labeled from the road. From the road, there is only a sign that says Midway Geyser Basin. The Grand Prismatic Spring is the main attraction in that basin, and it would be a lot more helpful to parkgoers if the spring itself were part of the signage in that area.
Once you get to the parking lot for that area, there's a long plank pathway that goes across a bridge and up two or three ramps before making a circular path a half a mile long along the edge of two or three hot springs in that area. The Grand Prismatic Spring is the most spectacular of these, but again, because of lack of labeling, it's not immediately clear which spring it is. Because most photos of the spring have been taken from above, the eye level view is not necessarily what one expects, and it's easy to confuse one spring with another.
One major drawback for visitors is that the plank pathway is only about 6 feet wide, not nearly wide enough to permit free passage when there are more than a few visitors. Surprisingly, there are virtually no railings between visitors and the sulfurous mud a foot below, even though it's evident that if someone fell in, they could easily hurt themselves or the landscape.
The Spring itself is a remarkable natural phenomenon. With all the steam and fumes rising up, the surface of the water is not very clear, but the color combinations and odors make up for the general haziness of the environment. And the oddest sensation of all is to walk along the pathway, alternately feeling the cool breeze when the wind blows in one direction, and the sauna-like steam when it blows from the other way. Overall, sights, smells, and sensations you will never forget.