Tomato Spinach Pasta Salad

I wait to make this pasta dish when my garden is just right. It is hard because the spinach is about over as the temps rise, but the tomatoes are just starting.  This is wonderful and very adjustable to your own add ins.
Tomato Spinach Pasta Salad
3C uncooked rainbow rotini
3C chopped fresh spinach
3 large tomatoes, chopped
1(8oz)bottle ranch salad dressing
1C(I use one small can)sliced black olives
2C shredded cheddar cheese, sometimes I use cubed cheese
3T milk
3/4C sliced green onion, I use less
Cook pasta.  In medium bowl, combine ranch and milk and stir well.  Drain pasta; rinse with cold water to cool. In large bowl, combine cooked pasta, spinach, olives, onions, tomatoes and cheese.  Pour dressing mixture over salad and mix well.  Refrigerate until serving.
I add fresh ground pepper and I also think it needs crunch, so I use almost a whole bottle of McCormicks Salad toppings.