Which one is it for you? I have to be in the grass, can't do the concrete unless it is raining. The grass is what makes the Yellow Lot special. Easier on my feet, kids can play, and it is alot cooler than being on concrete with the heat bouncing right back at you. Not sure who made the decision to only have grass in one lot, but I am glad they did! But I do see quite a few people parking in the concrete even when there is plenty of parking in the grassy area. My question to you is why do you prefer the concrete? Allergies? Grass stains?