Lots of people like to save their vacations for the fall, specifically for the months of September and October. That is completely understandable for a variety of reasons.
For instance, the heat of summer will have calmed down at least a little in plenty of places, making it altogether more comfortable, which further makes it much easier to enjoy yourself.
For another thing, because we have more and more often been experiencing very late summers — with the weather somehow mild — you can still be sure that it will be warm enough for you to have fun if you choose to do something outdoors.
There are plenty of places which lend themselves quite well to these months, so that you will have the opportunity to enjoy yourself as well. Many of them may surprise you.