A single plan can have many components, so the plural "plans" is unnecessary in your example.
a) "What do you want to do with your life?"
b) "My main plan is to graduate, work hard for about thirty years and make a lot of money, then retire to the country and relax."
a) "Do you have another plan?"
b) "Well, I'd like to win the lottery and not have to do the 'work hard' part, but I'm not relying on that."
Your example might be commonly expressed as: "Making money and relaxing, that's my plan".
not a teacher