I am stuck on Mars, can't travel anywhere
Yes, you are stuck. You missed a few things while still on earth which were essential to do before going to Mars, and there is no way to fly back.
Load the latest save game right before you flew to Mars. Before flying to Mars ensure you have five locations to visit, of which you already know Lowell Percival and the casino.
You can find the remaining three at the following locations:
Power Plant (at Terraform), Dr. Lawrence Barkley (at Terraform), Aerobics Academy (outside, Rick Logan)