What is wonderful about hot tubs and spas is that you can enjoy them alone, with your significant other, or with friends. They come in various sizes, so it's totally up to you what style to get and how many people will be able to fill it at one time. When not in use, good hot spa covers are important to protect the spas so that they're ready to go when you are.
Personally, I prefer to just settle in on my own and let the vibrations of the water take me away to a land of peace and serenity. It's so nice.