Student or Learner
In the following sentence, can I use should or can instead of could? If not, why can't I?
If you want to get a better feeling for how the city is laid out, you could( can or should?) ocan walk downtown and explore the waterfront.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.