I won't lie to you, you have a potential friend wrecker of a situation to deal with, but how you deal with it will determine the response. Your maid of honour and bridesmaids have put together a weekend (or how ever many of days) of a party right in tune with the "boys gone wild" type of event. You're uncomfortable with this and your maid of honour should have been aware of this from her friendship with you. It would appear that this party is more about the bridal team than it is about giving you a fun send off to married life. I would suggest that you have a quiet word with your maid of honour. Invite her for coffee at a local spot where the two of you can have a quiet word without the entire clientele knowing what you are talking about. Tell her that you appreciate all the planning that she and the bridesmaids have put into planning this "weekend", but that you are really uncomfortable with the private entertainment that has been planned. You might mention specifically the plan for having the strippers is particularly distressing and that it makes you feel uncomfortable. She may counter with the argument that this is what all the Vegas parties do and your response should be again that this makes you very uncomfortable. Keep saying this to any arguments that she might put forward. If your maid of honour is a true friend, then she will offer to cancel the strippers. You could then say something to the effect that it would be nice to take the time that had been planned for that activity and have a spa treatment instead or that cancelling that portion of the day/evening would allow for more time at the slots. End the conversation by saying that you really appreciate her being so understanding and that you are looking forward to the weekend. Should she not offer to cancel the strippers, you then have a real problem to deal with. You can then just accept that it's no point to argue further or you can choose to be vocal and say that you had hoped that there would be an acceptable way to resolve the problem. At that point, you have to decide whether it's best to go to the weekend and avoid that part of the celebration or to attend it and not participate in the unsavoury bits.
Wish that I could offer you a better way of dealing with this. But unfortunately, celebrations like this are all too common and rarely take the bride's feelings into account. All the ladies seem to think that it's necessary to have a wild time and do things that they would normally never think of let alone do. Stay true to your morals and don't do anything that you would regret later on. Let the bridesmaids and MoH have their fun without shaming them, but that doesn't mean doing something you would never do any other time in your life. The same goes for the mindless drinking and drinking games. Don't be pressured into drinking too much or just drinking period. Behave the way you would normally behave and leave the games to those who want to play them. That doesn't have to include you. But, at the same time don't be wagging your finger at them in a preacher sort of way.
Good luck with this! You have a delicate situation that could spell the end to your friendship with this group of ladies. Handle it well and you will still be friends. If things go south, you could end up with a very cold bunch of bridesmaids or with none at all.