group tours/guided travels for people in their 30s

Hello lovely people,

do you have any recommendations (maybe even from personal experience) for group tours/guided travels for people in their 30s? I'm very lucky to have one year of travelling ahead of me (sabbatical) and I'm planning to travel mostly solo but some countries I would rather explore with a group/a tour guide. I'm flexible on the time span/season/country.

There are so many offers online, I would love to hear from your experiences or your recommendations. If you have

Thank you very much in advance :)

Author: Bajazuza