All along people know there are 2 routes up to Mt Agung. One is start point from south side side at Pasar Agung (1525m high above sea level) and takes about 4 hrs acend and 3 hrs descend, reaching lower peak at 2907m. This offers views around the south end only. Another start point is from south west side at Besakih (1200m high) and takes about 14 hrs up and down. This is a longer route, but offer spectacular 360 degree view at the highest point of Mt Agung (3142m), but not for the faint hearted.
I chose Wayan Guide (firstname.lastname@example.org) who offered a hybrid path which they found a few years back. It is more challenging and more fun. Start at Pasar Agung, it follows the normal path until elevation 2300m, where the path diverge to left side of the mountain and cross over to the north higher peak. Takes about 5 hrs to ascend, and you have a choice of which route to descend.
For those who are strong, I'd recommend going up the highest peak for unimpeded view. The lower peak view to the east where Mt Rinjani is is blocked by crater rim.
I would strongly recommend Wayan Guide who has a consortium of mountain guides. My guide was Wayan Wasar, whom I am deepy appreciative for. He got everything prepared -- assortment of breakfast comprising bananas, biscuits, hot coffee/tea, cup noodles, rice cakes etc, camp fire (to fight the cold), and he took great photograph of me at the highest peak!
The lead guide Wayan Widiyasa was kind enough to lend me his triclimate overcoat, which shielded me from the cold wind and breeze at the top. He also lend me the mountain stick was not that useful for me as I am not used to.
The guides are a bunch of people who genuinely take care of you, for the perfect safe climb up and down. Thank you Wayan(s).