At home you can make arrangements to suit yourself, like lying or kneeling most of the time. I am typing this on my home computer, kneeling on a cushion.
If you can sit for a short while, you don't have to give up eating out. If a restaurant has a bar, stand and have a drink while you're waiting for the food. Check the chairs in the local restaurants to find the ones you can manage best. Some people prefer padded chairs, some prefer restaurants with booths and benches where you can bring your feet up. Buffet service reduces the time that you have to sit. Plan ahead and make sure that everyone with you understands what you're doing and why before you go.
If you're going to the cinema with family or friends, get them to sit at the end of a row where you can stand or lean. Some cinemas have double seats where you can take off your shoes and bring your legs up beside you. Of course it's best to pick a time when it's not crowded.
You should avoid activities which aggravate the pain. But coccydynia does not usually prevent people from walking and many other activities. Keeping fit and healthy and getting out to enjoy yourself are important in keeping your spirits up. It also gives an opportunity to do things with family and friends. You may be able swim, walk, jog, play tennis, badminton, squash, golf, or other games.
Most people find cycling and horse riding too painful. However, some people can still enjoy them without pain, when using the right seat. Here are some possibilities for cycling and horse riding.
If you lift weights, here is Linsey's tip: "Always hold a weight on each side, even if you are just working one side of the body. The weight balance seems to protect the tailbone from additional stress and aggravation."
If you enjoy a sport like skating or snowboarding that has a high risk of falling, you can buy 'crash pants' that provide padding over the tailbone. There are many types available - here is an online search for them.