My father owns a small land surveying operation in Maine, that I have worked for on and off for several years. Being skilled in CAD can be a great asset, that can be applicable to a lot more fields that just surveying. Plus, if you like being outdoors doors, being a field technician can be an enjoyable experience. Truth be told, sometimes it's a rough job, but sometimes you forget it's work

I can remember many warm, sunny summer days that I spent locating property on the coast with a cool sea breeze cooling me down, thinking "I'm getting payed for this?!" Of course, results will vary depending on your location
But as far as "what you're getting into," there's certainly a lot of math involved; mostly trigonometry. However, the vast majority of it is all calculated for you by your computer, hand-held data collectors, etc. I imagine that you'll also learn a lot of about real estate law, and zoning/property regulations.
Also, keep in mind that surveying is an industry that will always be needed. My father hasn't had the slightest problem filling his schedule since the depression in the late 80's. Even with several "rival" firms located within the same town, he's busy year round.
If you have any specific questions, let me know