I am sure there is a thread about similar questions but could not find it.
1. I don't think there is a shower in any of the Copa lounges.
2. I think the hours were extended from 8-8 this past month. double check on their website
3. Uber is about 25 $ or so - give or take. not sure how long it takes.
The visitor center and watching the boats cross the canal is very anti-climactic
I was not impressed at all. Maybe if I would be in the boat things would look different.
I am sure many will disagree
found the old thread
Copa, PTY looooong layover