Don't talk about the future. Seriously, just don't. Trust us, you don't want to be 'that guy' stuck in a temporal anomaly for 500 years.
When approaching ancient civilizations, be prepared for unsolicited historical lessons.
Remember, the pyramids were not just built in a day. Or a century. Or 3 millennia. Okay, fine. They were built in like, a thousand years or so.
Read Part II: Advanced Time Travel Techniques Read Disclaimer: Because You Clearly Haven't Read the Fine Print Read FAQ: We're Not Saying You're a Time Traveler... But You Might Be...