Casual babysitter, Saturday or Sunday for 2 boys

Looking for a casual babysitter for two boys, 7 and 17 month old. Once or twice a month on a Saturday or Sunday. Hours our roughly 12 till half 6 in the evening. Must be okay to mind in our home. If we happen to find the right candidate for looking after our boys, there is a chance of a few more hours during the week. No bedtime or naps to worry about as we will be home for this. Really looking for someone to bring them for a walk, feild go on adventure. Someone active! Only cooking required is doing dinner for them but if not comfortable cooking we can organise somthing.