Pretty much everyone wants to get married, but not everyone is going to want to have to do a huge bucks party, especially if they are introverts. Introverts prefer scenes that are more relaxed, situations that would not force them into any serious social interactions that they might not be able to deal with. The important thing to remember here is that just because you are an introvert does not mean that you are going to have to skip it entirely. There are actually quite a few relaxing ideas that you can look into if you want to be able to have a good time, all of which are going to provide unique ways for you to relax.
One really fun activity that you could look into for your bucks night is fishing. It might sound odd to a lot of people but the fact of the matter is that a bucks night is meant to be the sort of thing that gets you out of the city, and even though fishing is an outdoor activity the fact of the matter is that it is very relaxing and calming and can help you reflect to a great extent. This is why it is so important that you look into fishing and try to have a nice time that does not involve wild debauchery and the like!
If you want your bucks holidays to be the best that they can be, try hiring someone to organize it. It might cost a little more than you are used to, but at the end of the day this holiday is supposed to be the time of your life, and you are probably not going to have a very good time of it if you are stuck organizing things.