The Great Pyramids are very very crowded so I advise you to go either very early in the morning or go after lunch if you want to try to have fewer people around. It is a better experience if you go with a certified guide, book one before you travel and they will usually pick you up from your hotel and drop you back to your hotel after the tour is finished. You have to purchase an extra ticket if you want to go inside of the pyramid, the general ticket just allows you to see the outside of the Great Pyramids. If you want to use a camera, not just your cell phone camera to take pictures there is also an extra fee. There are student priced tickets that are much less than regular priced tickets, if you have an student ID. Citizens of Egypt also pay less than non-citizens. This is an amazing site and no visit to Egypt is complete without visiting here.