巴厘岛火山口的难度（Caldera Batur hiking）

国庆计划去巴厘岛度假，包车公司推荐了一个火山口徒步的线路，具体如下，不知道有哪位大侠走过？我想了解一下整个线路的难度如何，因为还带着68岁老妈，怕她走不下来。
CALDERA SUNRISE TREKKING ITINERARY:
Pick Up Time: Pick Up Time: 3-4 am
04.15-04.45: Boarding mini bus to Ulundanu, the starting point
05.00-05.15: Arrival at Ulundanu, begin trail trek up to Caldera wall.
05.45-06:00: Arrival at top of caldera, where we witness the spectacular view and sunrise, while there we enjoy refreshment of hot tea or local hot coffee
06.30-07.00: Continue our trek around caldera crater (along this walk we’ll see/visit the traditional Balinese mountains people and homes) and begin our descent to Pulak (tiny little village on shore) where our traditional canoe/boat is waiting for pick up.
08.30-09.00: Leaving Pulak on traditional canoe/boat then cross the lake Batur
09.30-10.00: Arrival at Finish point .