Many years ago, before I was married, I was in Australia working on my own and went on a two week coach and camping trip from Sydney to the Great Barrier Reef and back, through the Blue Mountains, etc. It was great, couldn’t have done it in the time on my own, and am still in touch with some of the people I met.
Have also been to Cuba, Albania and a couple of other countries with a female friend using VJV, Voyages Jules Verne, which were very good.
Last year I went with my husband to New Zealand for a holiday and he didn’t want to go to Hobbiton so I went on a one day coach trip without him, much to his amazement! I didn’t want to drive our rental car down there on my own, so the coach day trip from Auckland to Hobbiton was very relaxing. I met an amazing number of people, both single and married, all ages and from many nationalities (some Japanese, Koreans, Canadians, etc). Everyone was a fan of the Hobbit, and the Lord of the Rings, and I had a wonderful day.
My husband hates the idea of coach trips (never having been on one, it has to be said!) but in general I like them. As with any holiday, dont get upset by minor issues, or irritated by some other people being a bit bossy. Perhaps plan some free time on your own, possibly have a meal or two away from everyone else, and do take advantage of someone else doing the driving and organising.
Quite well off friends of mine go on several coach trips a year, either in the UK or Europe, they go in a group of five and join a bigger trip, they say they couldn’t drive to the places for the price, it’s always possible to order more wine (!) and you may meet people you really get on with. ?