General Question....
 

I'm 5'2" and about 144-145 lbs. How many calories do you think I would burn walking about 3.8 miles, with hills involved? :?:

That's really hard to say, because it also depends on how fast you are walking. But, probably something like 400 calories.

Go here:
http://www.healthstatus.com/calculate/cbc

There are lots of calculators on the Web--which may or may not be accurate.