I've only traveled with Avalon and I'm with you on not being keen on excursions, however, these tours are included in the price of your cruise and for the most part they are pretty good. I can't think of too many I didn't like. I wish I had passed on the Vietnamese water puppet show but what can you do and I wasn't too excited with the Music machine museum in Germany. We tend to do a combo of going on the provided tour and going off on our own, esp when there's an overnight in that stop.
The nice thing is you can decide as you go. No need to choose now ... wing it and do what you want on your vacation.