Stay at home moms - what do you do?

I have a 3 week old son (first time mom) and I’m currently on maternity leave and will not be returning back to work due to husband being gone for the military. I’ve always been used to working full-time, attending college, etc. so I’ve always been busy! Now, I take care of my son of course but I feel like I need something to put my time into like a new hobby or something. I’ve started walking at a park every few days as well as meeting up with friends and family when possible but what else can I do?

Any ideas? What do you do to occupy your free time throughout the day? I’m sure as my son gets older then he will be more active but right now he sleeps most of the day!