Background:
My undergrad is in Kinesiology (Sport Management option) from A&M. I have an MS in Exercise Science from UH that was a thesis degree designed to go further down the research road. I applied and got into grad school at UT, A&M, and UH and chose the one that offered the best employment for $$$ purposes.
My degree required an internship and I turned down one that was a strength and conditioning job (I already had CSCS and NSCA-CPT certification at time of graduation) for a job with ClubCorp. Personal trainers CAN make a lot of money. I was charging $50-60 per hour and bringing home 65% as my supplemental job. Some of the trainers I worked with were wealthy - 6 figures and driving BMW type of lifestyles and that was 10+ years ago.
Anyway, I got into a Ph.D. program and did one year and then quit. I did not like the route I had taken and woke up one day wondering why I was working with rats and beheading them and shredding flesh from their bones and making slides out of it.
I was interested in performance and went down a science-related route in grad school because I was told it was better money. Bad decision. Ph.D. and being a prof is a great gig, but you MUST love what you are researching to be successful and enjoy the lab. Do not do it because your parents are OK with kinesiology as long as you're called "Dr. Lastname" for purposes of respect.
I got into teaching and coaching (which is where my heart is) and I love it. We're not wealthy, but we clear north of $125k as a two-teacher family and we can afford to live in a nice neighborhood and take big vacations every year.
As for what you can do...
-Coach and teach (this is obvious)
-grad school in several disciplines; precursor to Exercise Physiologist/prof
-PT (although this isn't the easiest degree to get into PT school with)
-OT (not truly necessary or even helpful to major in Kinesiology)
-S&C coach (degree is very useful in this career path. Get NSCA certification and other certifications for sports you are most interested working with.)
-Personal trainer (get some sort of certification while you're an undergrad so you have work experience.)
-Professional or collegiate sports (if Sport Management)
-Gym ownership (this is where the money is if you know what you're doing)
-Event management (races, etc.)
-Cardiac rehab (I didn't have many friends do this)
You are limited by your own creativity. I do think the degree is very well rounded and prepares you to gain entry into a field that you're interested in.
I recommend attaching a business minor if you can. Take accounting, finance, marketing, management, business law, etc.
I had several classmates who opted out of Kinesiology careers make killings in the oil/energy and corporate real estate fields.