I'm on my second mat leave with DD (15 weeks). DS is 3.4.
Two days a week I have both of them together, so we go somewhere in the morning (soft play, library etc). In the afternoon, we are generally at home and I don't plan to get much more done than a load of laundry and a simple dinner.
The other three days DS Is at nursery so it's just me and DD. I loved my first maternity leave with DS and was always out at groups or meeting friends, and I wanted to have a similar experience this time around. So I have been going to the cinema and to a Buggyfit class, but my day ends up feeling packed as I also need to get some housework done and then pick up DS at 4pm and make dinner. I feel a bit guilty for DD sometimes as she is growing up so quickly. At the same time, I do need to get out of the house! I'm not sure what the balance should be, how did you spend your second/third mat leave?