What kind of water activities should a pregnant person avoid at 4 months?

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I am going to Hawaii in 2 weeks for the first time and my friend that I am visiting is 4 months pregnant. What can she do and not do? I wanted to go snorkeling, parasailing and the different boat tours. What are some fun things to do in Oahu other then the beach and shopping?

take it easy parasailing….but snorkeling most deffinetly safe..probly even healthy for the unborn, so beautiful….and nature walks veiwing all the exotic flora and waterfalls…feast on the local tropical produce…pamper yoursleves
She should ask her OB. But hot tubs are a definite no-no. Snorkeling should be OK; boats may be too rough and parasailing would, I think, be too risky.
boat tours would be good….even snorkeling…just as long as she does not enjoy the jacuzzi
have fun!!!