bocastephen,
Thanks so much for the comments. I was concerned that Lanai might be too much for one night, we will make it longer on the next trip. I also appreciate the comments about seasickness, as one member of our party gets sick thinking about it! Those pills put a real damper on the day, so it's likely not worth it.
We are staying at the Wailea Beach Marriott on points, so the price is right, and I'm really looking forward to visiting Maui after a ten year absence!