We got back from the Beach Club a couple of weeks ago, and you will love it! I would add:
1. Building on what Josh said about the snack tray on top of the armoir - have housekeeping remove it. We could see right away that it would be a problem (my boys are 3/5/7), so we just had them take it away.
2. The video arcade is geared more towards older kids (> 10). There are no games that give out "tickets" to be redeemed for prizes. We actually took a drive one rainy night to the Contemporary so my kids could play some games for prizes.
3. Be sure to bring resort IDs for everyone when you go down to the pool. They will check them and give you wristbands to wear.
4. The quickest way to Epcot is to walk to the International Gateway, rather than wait for the boat.
5. The Cape May Cafe clam bake is excellent.
Have fun!