I had 5 kids in 10 years.
The first three were 14 and 17 months apart.
The fourth was 2 years from them.
The baby was 6 years from that.
I know exactly what you are talking about......multiplied!
I remember it well.
Even hopping in the CAR to GO anywhere, was an exercise in futility!
But yes...these days DO pass quickly and they are "little kids" for such a very short time. Have you tried to get them involved with doing crafts and making things...even "helping" to make juice popsicles and decorating their own wild& crazy cupcakes when the weather isn't as hot and humid? There are TONS of websites like "makestuff.com" that have great ideas and suggestions for this kind of activity, age-appropriate and everything! I have no other advice on what to do---but know that you share a very common complaint with other Moms everywhere!
hugs,
Annie