Daytime "Mommy's Helper" for two kids 2/3 times a week

My kids are 4 and 18 months old. They are two sweet, fun loving kids who love activities and outdoors. We live in a tiny house with lots of space for outdoor activities. I am looking for someone to just help me with the childcare during the day. I will be home while you are there, so I am looking for someone who I can get along with as well. Mostly I would be asking you to help make snacks or lunch for the kids, take them outside/do activities with them; mostly just keeping them occupied while I handle my other responsibilities or get a break.