Welcome rimoabdallah,
I suggest the 172, but then I'm partial to Cessnas. Yes, it might be nice to take your sister, but if you do, do your best to not be distracted. Use the opportunity to get the most out of the experience in "real time". I'd forget the GoPro if it would be any distraction whatever, and just enjoy what your flying.
Do your homework first, and have questions prepared for the instructor. Take time before the flight to understand the aircraft - it's not costing you money, while it's stopped on the ground. Be patient about flying so you're ready, and not using your time in the air to ask and answer questions which you could have learned on the ground before hand, or after. Deliberately plan to do some sight seeing, but don't forget to learn about the plane and flying too.
Enjoy our passion.....