I, on the other hand, usually grab the Lonely Planet Guide, my hand sanitizer, and my backpack and hit the road.
However, I see the appeal of pre-packaged tours, and I have even been on one. When I traveled by myself to India, I felt more comfortable tagging along with a tour group. I guess it wasn't exactly grandparent-style because it was the economy version of the tour and we stayed in budget accommodations and traveled on public transportation, but it was still a tour.
I appreciated traveling with a group. During the days we would do our own things, but we would always come together for dinner at night. Since I traveled with a British company that focuses on eco-friendly, community-minded tourism (Intrepid Travel), my travel companions were mainly Australian. It was fantastic to meet new people and build camaraderie.
For our honeymoon, I don't think we'll want to go on a tour because I think we'll want to focus on each other. But, I realized I can get good travel advice by looking at tour group itineraries--for free! It's brilliant!
For example, if we go to Italy, I can find tours that travel in Italy and look at their sequence of cities and activities for ideas. It's very fun.