Bali is a great destination! The culture is fascinating, the people warm, the landscapes gorgeous, the vibe enchanting, and the food addictive.
We only stayed at Candidasa so can’t comment on Nusa Dua or Lombok. Southeastern Bali is rather quiet and very laid-back. Candidasa has a hillside temple worth exploring and simple home-style restaurants or warungs line the town center. Definitely not the razzle dazzle of Seminyak. The beach, at least at our hotel, was unimpressive as the shore is prone to erosion due to past reef damage by developers. Unless you have your own vehicle, it’s worth getting a car & driver to take you on a day-trip to Tengannan village, Amlapura and Tirta Ganga.
You might also want to explore accommodation options at Mangiss, west of Candidasa, which has another stretch of beach.
If you’re keen on volcano hikes, about 2 hours north of Candidasa is Gunung Batur and Batur Lake. You could stay either lakeside or at Penelokan village with great views of the volcano, caldera and lake. We stayed at Lakeside Hotel, a bit atmospheric but otherwise good for one night. Don’t stay in shabby Kintamani town, further up the road from Penelokan. We found the locals a bit aggressive and greedy and the town was full of tour-bus day trippers and cheap trinket vendors.
We also enjoyed 2 days in Munduk, a village in the mountainous coffee-growing region south of Tambligan Lake. The scenery is lush and forested and has good day hikes to waterfalls and scenic rice fields. There are small family-owned hotels and B+Bs and we found the home-cooking to be just as good as in Ubud. You couldn't be farther from the crazy Kuta beach scene here.
From Munduk it’s 2 hours to Ubud. Your Ubud accommodation shouldn’t be too secluded (as in the many outlying rice fields or adjacent valleys) as you’ll definitely want to spend lots of time in town exploring great restaurants, cafes, museums, arts & crafts shops, spas, cultural performances, the Monkey Forest, etc. You may decide to stay longer than 2 days!
But don't stretch yourselves trying to do too much in only one week.