In the north part of central Saqqara, about 500m northwest of Djoser's pyramid are two very beautifully decorated mastabas. That of Ti, overseer of the pyramids of Niuserre and Neferirkare, and a few hundred meters just south is the double mastaba Ptahotep and Akhethotep, father and son. These mastabas are not normally on the tourist track but I highly recommend visiting them.