FWIW if you’ve never been to Spain it’s a lovely country and Andalusia is in a magnificent part of it. Granada, Seville, and Cordoba are all within close proximity and all are well worth a visit. You might want to extend your trip to include Catalonia - the southwest for the scenery and Barcelona for the food.
My eldest son took a semester architecture course that was taught in Europe. They toured much of Europe doing architectural assignments. At the end of the course they were allowed to travel individually for a month wherever they wanted. I recommended he visit the Alhambra. It blew his mind. I've always wanted to see it.
Heretofore, I've always arranged our own trips (hotels, air, train, rental car, destinations, sights) and have never taken an organized tour other than our high school senior trip. My wife says I should have been a travel agent.
My alumni travel organization just sent a brochure on a tour they are offering in Egypt. It was surprisingly cheap. Usually they want an arm and a leg for any of their tours, so I did some checking tonight. If several online reviews can be believed, the Nile River ship, crew, and food were awful. That's why the tour was so cheap. They must be having trouble filling some of their expensive tours.