It's damnably difficult to find a volcano in Second Life! I spend a short while in the Amazon River area, but found the volcano there impossible to easily find; to be in this area one must wear a HUD which punishes you for camming to other areas, kills you if you follow rivers, and puts you in a cage if you take it off - all of which definitely impede any attempt to find a volcano three sims away! I ended up instead on Orwood Volcano, a Linden build which is complete with occasional events - spouts of flame into the sky, flying lava rocks - as well as the even glow of flowing lava. I love the Protected Land of the grid, all of them little frozen balls of art created ages ago by Linden employees. Sadly they didn't continue their builds, updating them as the tech of Second Life improved, but they are often still lovely areas and good for photography, leaning heavily on legacy textures and Linden trees. Expect to be able to get a lot out of your windlights, and to have to angle sharply to avoid surrounding buildings - de-rezzing them can also work well.
