General:
* Observant: This is a general term for someone who pays attention to their surroundings.
* Attentive: Similar to observant, but emphasizes active focus and engagement.
* Perceptive: Implies a deeper understanding of the environment and the ability to draw insightful conclusions.
* Astute: Suggests keenness of observation and judgment.
* Aware: Emphasizes the person's consciousness of their surroundings.
More specific:
* Strategic: If the person is using their observations to plan or manipulate a situation.
* Tactical: If the person is making decisions based on immediate needs and circumstances.
* Analytical: If the person is breaking down information from their observations to reach logical conclusions.
* Pragmatic: If the person is prioritizing practical concerns and making decisions based on what works.
* Opportunistic: If the person is taking advantage of opportunities presented by their observations.
Informal:
* Street-smart: If the person is adept at navigating urban environments and making decisions based on real-world situations.
* Savvy: Implies a quick understanding and ability to make good judgments.
Ultimately, the best word depends on the specific situation and the traits you want to highlight.