Penguin, can you give me a brief overview as to what your "history" is (as I am too lazy today to search through your previous posts

) What is your undergrad degree in? Do you have any planning experience so far? What is your 20 year plan?
Why do you want to get a degree in LA? With the notable exceptions of physical site design, streetscapes, and landscape plans, most of the TOD work is much more planning heavy. Three years of LA school is going to burn you out, so don't make this more difficult for yourself. Landscape architects are much more able to take on planning projects, and I know several who do it without a formalized degree/certificate.
Get through your LA degree (if that is what you want to do) take some planning electives, get a job as a landscape designer, and see what other TOD work you can take while on the job.