We spent a lovely week with four grandchildren in a caravan at the Rosneath Holiday Park in Argyll in July. The GC are 8, 6, 4, and 2. We stayed there as they only live 3 miles away, and their mother was handy if we needed her. The GC loved it. It was away from home, they loved the caravan, a static one with three bedrooms, two shower rooms, and all mod. cons. There was plenty for them to do, the childrens' club had loads of activities for them, games and crafts. The 2 yr old painted some lovely pictures which all ended up being a muddy brown colour. It was only a small park,xand quite quiet as we were there before the English schools broke up for their summer holidays.
I hope I have given you an idea. We had a fabulous time. Enjoy them while you are still fit enough!!