When you are traveling to another state or just going longer distances in the same area, you want to be comfortable during transit. If you live right in Virginia, Maryland, or DC, you may not need to hire transportation. That would only be necessary if you lived far enough away from where you want to go that it would be uncomfortable and inconvenient. This might work best if you are alone and not with a group.
On the other hand, when you are traveling to the area with a group and tours are planned, it is a good idea to charter a luxury bus, van, or other vehicle. You can even get large limousines. In fact, it is surprising how much comfort and fun can be packed into one vehicle. Just any old bus will not do the job and all of you will be out of the comfort zone in a school bus. When you are in Virginia, you will find that american transportation offers a full line of luxury transportation to choose from.
Basically, any time you want to hire a driver and a tour bus, go with the best. Especially if the cost is split by the whole group, nobody is at a financial strain. Make the touring and driving about fun and more fun than you thought. It is not only possible, the company providing the vehicles makes sure that you have all the luxury you want and more. The folks you are traveling with will give you praise for this.
No vacation is that much fun with stress. Hot or cold weather without shelter can ruin a trip. Since all the people you are with want to see the sights of Virginia and DC, what better way is there to do ground travel?