Hi Kathleen! In addition to the assistance with vacation planning and the refreshments offered throughout the day, there are a few other perks to staying on the club level at the Polynesian. When you arrive, you won't have to wait in line in the lobby to check in, but rather will be taken to your room and allowed to check in with the concierge cast members at your leisure while your enjoy a cool drink. Your room will be located in the Hawaii longhouse, which has a great location near the volcano pool. You'll also receive turn-down service in the evenings (but so will anyone else in the hotel who requests it). Your room will have extra amenities such as robes and a DVD player. You'll have access to the concierge lounge, which gives your family a place to sit and relax other than your room. If you have any questions or problems during your stay, you'll have easy access to assistance from the concierge cast members. Club level guests also have the option to book the Wildlife Discovery Excursion.
These perks really help make for a relaxing vacation, but in my opinion, the vacation planning assistance and the food and beverage offerings are the main reasons to stay club level. Personally, when I have the choice between a club-level room at a great price and the Disney Dining Plan, I choose club level. (However, keep in mind, that even though the Polynesian club level does provide a continental breakfast, snacks, evening appetizers and desserts with wine, beer and cordials, you'll still need to budget for restaurant meals, especially for lunch.) If you prefer to do your own vacation planning and eat in lots of restaurants instead of the club lounge, the Dining Plan may be a better option for your family.
Hope this helps you decide!