Nicaragua has a lot of volcanoes and they're not all dead.
There are 23 volcanoes in a country about the size of New York state. Almost without exception the volcanoes are on the western, or Pacific, side of the country. Of the 23, only two are on the east: Tambor and Azul.
Tambor, listed as extinct, seems to be near Monkey Point south of False Bluff.
Azul, listed as inactive for about 10 thousand years, is in the coastal plane of the eastern side of Nicaragua...the Caribbean side. Azul is pretty much engulfed in a dense forest and wasn't even discovered until about 50 years ago by an aerial survey...before any 'casual' use of drones.
As seen in the photo here, Azul is not too far from False Bluff. A day trip to Pearl Lagoon is quick and easy - but my guess that actually getting to the site of the volcano from Pearl Lagoon would not be easy.
Here is where the other 21 volcanoes are:
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...and a list of all of them: https://www.volcanodiscovery.com/nicaragua.html