The greatest show on the planet right now is in Indonesia and Mt. Sinabung which is spewing forth white hot lava and massive plumes of hot volcanic debris.
For volcano watchers worldwide (Frank and Jenny) Indonesia is known for especially "primeval" volcanic events.
RT Flights from San Francisco will set you back about $1200 USD. The last time this old gal went Pleistocene was back in the late 1600's. Should be an interesting couple of weeks.