What you might not realize is that there are over 100 pyramids throughout Egypt, but when you want to travel to see them specifically, most people choose the group known as the Great Pyramids. Located in Giza, these pyramids were created to symbolize the creation of the world, as the ancient Egyptians understood life. There is also some speculation that the pyramids were built to honor the dead, as many famous Egyptian rulers were buried in their own pyramids.
Located right outside of Cairo, it's actually quite simple to journey to the pyramids. By flying into Cairo for the main part of your trip, you can take taxis and local transportation to visit not only the famous large pyramids, but also the Sphinx. The trip takes only about fifteen minutes.
Though the pyramids themselves are a little dull from the outside once you've gotten used to the monstrous size, you can go into the pyramids themselves to see burial chambers and other artifacts. Some of the rooms are a tight squeeze, so if you're at all claustrophobic, you might want to skip this part.
You can also go on an organized tour of the pyramids as booked by your hotel. These are fairly cheap and well worth it if you want to learn more about the history of the building and the times. Of course, if you're really cheap, you can see these pyramids from most tall buildings in Cairo.
If you want to avoid the tour groups, you might want to head to see the pyramids when it's the middle of the day. Granted, it's going to be really hot right then, but since many people forget this, you might luck out and get the pyramids to yourself. Just bring enough water and cover yourself up to protect your skin.