As single moms we need to spend some time doing fun things for us just as much as we need to spend time doing fun things with our kids. If you have some weekends when the kids are with their dad then try to spend some time doing something just for you. Go to a movie, get a manicure, go window shopping, take time to read a book, whatever it is that you enjoy doing carve out time to do that for yourself. You will make a better mommy for your kids when you spend time recharging your own batteries.
If this is a weekend that the kids are gone why not take some time to do something you enjoy. Give yourself a break and have a great weekend!