Yes, your interpretations are correct. Here are a couple of examples:
1. I've got three hundred spiders in this jam jar. Take a look!
2. Take a look at these spiders! There are over three hundred in here.
You do sometimes find a trailing "at" with no object, in infinitive phrases:
3. Three hundred spiders? Sheesh...Now that's worth looking at!
As for "cool", you can use it to express any kind of approval. (But this usage may become unfashionable in the near future. And it does irritate some native speakers.)