We did the swing at the restaurant, which was included in the tour. Not sure about the bath in the temple.

You can absolutely do the trip. There is some walking to the waterfall and around the rice fields but it is what you want to make it. Nothing too strenuous but they may choose to just look at the waterfall from the top as there are a lot of stairs to get to the bottom. With regard to the rice fields you can see everything from the top, you just have the option to hike around it as well.

The Ubud tours will pick you up once you have signed up to do the tour

Yes, you can do the swing at the rice terraces and restaurant. Don't understand your pick up questions, but if there are two bookings, then there would be two pick ups.

If I recall correctly this performance was on daily basis starting around 19:00-19:30 (at least in September where we visited Ubud). There were people in front of temples selling tickets stating that performance was only for today in order to convince you to buy the tickets. You may also check klook website where you can see which dates show is available (I just googled it and found this site).

Definitely! Maybe ask your guide to join you for lunch if you don't want to eat alone. Usually they eat in a separate area. You might also ask the guide if there are other solos trying to book the same tour if you want to share (or not if you prefer your own company).

I booked via Tripadvisor and was then contacted by the tour operator.

Unless you want to stay in Ubud this tour can easily be done from Kuta . I got to see a family house on the way to Ubud from Kuta so you might miss that if you started from Ubud or Seminyak.

You might want to email the company directly. They were great.

Dear Tracey, we provide private tours from legian, as long as it enroute custom tour is not a problem at all. Just let us know once you book it, set your request at special requirements. Thanks Wayan