First off, to have a good weekend you need to get some friends together. Boys, girls, whoever! Just get some people together who know how to have a good time!
Second, find out something to do. Something that just stands out to everyone when you say it. If everybody isn't okay with the idea then they could ruin it for everyone else!
Third, go out and do whatever activity it is you are planning on doing. Be outgoing! Maybe invite people you haven't talked to very much but you would like to know better to come and do the activity with you! You never know what may happen and how much fun it could be until you try it!
Fourth, Have an open mind about doing the activity. Whether it be something you're scared of doing or just something you don't want to do. Just be open and have fun with it! You may end up liking it more than you think.