Ladies I need some help.

My Captain is bored, I think it's borderline depression but he is extremely masculine and would never admit to this.

He is bored with work (it doesn't challenge him), he is bored at home (because he doesn't do anything). 

I love this guy a lot but I'm not sure how to fix this.

I need some suggestions for what we can do together.   It needs to be something calming and relaxing.

What are some activities you do with your SO after work and on the weekends.

I want to make him happy but I fear he is slipping out of my reach. We have been together for 5 years and both in our late 30s.