I joke not. Some of the most successful parties are the most simple. A couple of activities (I generally choose three). Anymore than that and the children are overwhelmed and the parents start pulling out their hair. It is a good idea to have a back-up activity or two, but seriously, less is more. I've seen parents trying sooo hard to push kids to do activities that they have put so much energy and time into planning, but the children just aren't interested. Parents can sometimes feel that they need to keep all these guests occupied every second, but the reverse can actually be true. Sometimes just being together with each other and playing with their own chosen activities/toys, can be a much better idea. That being said, allow for some down time between activities.
Here is a fine example of Simple from Sarah's Party Perfect. I love the homeyness of the party, the simplicity of the activities and extra's not to mention the cuteness of everything. She has definately used some KISS here!! I also totally LOVE the CD idea. It is a great way to remember the music and feeling of the day. You could also save it for later and add some pictures of the big day on as well.