[Alas, "cool" hasn't yet become part of her vernacular, but she'll assure the others that he has a friendly disposition (and while she won't make explicit mention of it, he seems to also have a healthy enough degree of self-confidence - that's more than can be said for most members of their group, frankly).]

Just be careful in your explorations! If you get lost or need help for any other reason, use your notebook or device, alright?

[Assuming he already received one, that is.]