For sure with the nice weather be out and about going for walks and passing by parks where families are playing. Have business cards with your info or at least type the info on a piece of paper ready to pass out to interested people you meet. An ideal family is a mom out taking her baby for a walk too. As you pass stop and say hello, introduce yourself as a caregiver in the area and then offer one of your info cards should the mom be looking for daycare.
I made a sign and posted it on the back of my wagon when we first moved to the area and then every day just went out and walked - as slowly as I could so people had time to read,lol. and the last line of the sign said stop me and ask for info and a few people actually did. Of course at that point I only had my own kids in the wagon but gradually it was one dck then two, etc. till I was full but it was a great way to spend the summer.