If you are deciding who to tour with - do it with Agus. I can't imagine that there is anyone in Bali able to top the experience he can give you. We did three full days and asked Agus to show us as much of Bali as he could, and goodness did we squeeze in a lot! We didn't know where was best so we gave him free reign over the itinerary (and if you don't mind what you see, this is a good way to do it, afterall he's the expert and knows the best sites and best times of day to go. To give you an idea of what we covered:
Day 1 (central): Batuan village (a traditional compound, village temple and a school, a real treat), Goa Gajah temple, lunch in Kintamani with beautiful views of Bali volcanoes, Ceking rice terraces, coffee/tea farms, Ubud Monkey forest and Tirta empul
Day 2 (east/north east): Gianyar market, a bamboo forest, Penglipuran village, Besakih mother temple, Rendang rice terraces and Goa Lawah temple (bat temple)
Day 3 (west/north west: Tanah lot, Twin Lakes, Munduk waterfall, Jatiluwah rice terraces (UNESCO world heritage site), Lake Bratan temple
You can choose to tweak itineraries slightly or build your own completely - if you've seen places you like on instagram, you can even send to Agus on whatsapp and he'll take you - he's a font of knowledge so you can try to catch him out but I doubt you'll be able to.
These experiences we had were off the usual tourist track (which is what we asked for and not easy to get with other tours) but it still included some of the more well known sites which was a lovely mix. Agus also seems to have access to everywhere; because of how friendly he is, he seemed to know everyone no matter where we went - don't underestimate this as he manages to get the best tables in restaurants with gorgeous views when you stop for lunch.
We loved our trips and take away so many fond memories, hundreds of photographs and a really sound knowledge of the culture in Bali - a place which Agus clearly loves and now we do too. All we recommend is that you book early - his diary fills up (as it should).