[ElkGroveDan]

Wouldn't it be fun to hang glide off of some of those cliffs that probably dwarf anything on this planet? Yeah, but due to the tenuous nature of the Martian atmosphere, that glider had better have BIG wings!

Agreed, but not as big as it might seem, since gravity is only 1/3 of the earth, so an average man would weigh 60 pounds.

[orionblamblam]

> Agreed, but not as big as it might seem, since gravity is only 1/3 of the earth...

Here's your problem... performance is based on speed, weight, air density, coefficients of lift and drag, and wing area. They are all linearfunctions, except for velocity, which is squared:
Lift = Wing Area * Cl * 1/2 * Rho V^2
For the same forward velocity on MArs, all else equal except gravity, you'd need 38% tthe same lift. So, a wing 38% the surface area. But... atmospheric pressure is about 7 millibars (1 barr being sea level on Earth), and an atmosphere of CO2 instead of nitrogran, so the denisty woudl be about 0.007 * 3/2 that of Earths, or about 0.0105 that of Earths... so divide that 38% size wing by 0.0105, and you'd need a wing 3619 % the size of one on Earth, for the same performance at the same weight and aerodynamics.