Things I'm doing the first few weeks include going for a walk absolutely every day. To start with, it was around our tiny courtyard while DH snuggled the baby. After 2 weeks I could make it to the local bakery to buy myself a treat. DH helped me prioritise my walks over housework, because my walks have a huge mental health benefit that housework doesn't.
On visitors: we've introduced him to our parents, siblings and grandparents. Everyone else was informed that they can visit after he's had his 6 week vaccines, to give us time to settle in as a family.
As I'm home for a year, we also got an annual family pass to the local zoo. There's lots of other parents the during the day, plenty to look at, and I'm very fond of it. Our library has baby time, and the gym has a crèche. Between those and the local parks, I've got lots of options whenever I feel the need to leave the house.