We are looking for ideas

We have the coolest neighbors--except of course when the Richey's were our neighbors...Anyway, this couple has two children, both married. They live across the street from us and have kind of adopted us. In the summer, they invited us to bring the boys over and swim in their pool. At Halloween, they made special cupcakes just for the boys and gave them candy for their bags. They live between two houses that are empty. There used to be widows that lived in the houses but they have either died or been placed in a nursing home. When they were still in their homes Max (our neighbor) would regularly mow his lawn and both of these widow's lawns. One of the widow's would call out his name at 2 am and he would go over to her house to see what she wanted. He came and set the mouse traps for us when Mike was in Guam and also jump-started our car when the battery was dead--and he got out of bed with the flu to do it for me because Mike was out of town! They are such great people. When Isaac was born, Sheree made a monogramed blanket for him with his name and birthday with the onces and pounds he was when he was born. Tonight they came over to our house and brought this diaper bag and two burp cloths that she made for us. They are awesome! I love them. We are just so grateful they live next to us. Mike invited them to come to church when we bless Eli and they said they'd come. Mike and I would love to do something for them in return but don't know what to do for them. They are in their late 40's, early 50's and their kids are our age. So what would be appropriate to do for them? Any ideas?