Must do experience in Bali, Indonesia. We hired a guide to take us up the volcano, I can highly recommend @mt_batur_trekking_guide on Instagram. Wayan was a fantastic, friendly and patient guide. The cost of the trek was 250k IDR per person (~ £13) this included the guide, ticket, breakfast and water. Wayan also arranged transport for us to and from the volcano which included a free stop at a coffee plantation! The taxi was 500k from ubud which split between our group of 4 worked out to be ~£