Just got back last month!
Was defiantly up my expectations.

Highly recommend booking at the volcano lake near Santa Ana area volcanos.

-Lake Coatepeque hike. People said it was 4+ hrs but it wasn’t near that. Our group with frequent stops made it in 3.  Hire a private guide. 

There’s several reasonably priced high end resorts that have stunning views.  Was the highlight of the week. 
-Cardedeu Residence is stunning lake side resort on the crater lake. (We stayed 2nights)
-Casa 1800 is up on the actual volcano.  Look up both if you’re in the area. (2 nights)

I can say lots more if you’re curious those were just real gems. 
https://m.primal.net/LnYn.jpg