1) Everything is in USD so be prepared. Salad at the spur in the one resort is like $15.
2) NB: when i went in 2013 the ATM gives a max of $50 a day so take cash with you. We stayed at a backpackers and had to pay cash which we couldn't get from the ATM.
3) Enquire about the water levels, some friends went last year and yes, it was literally just a trickle - complete waste of money.
4) Go to the Chobe game reserve. Was an amazing experience. Got right up next to the elephants as they swam across the river.
5) Spend the cash on the helicopter flight, was definitely worth it even if it was pricey.
6) Walk around and check the place out. If you stay on the Zim side there is a place set up by South Africans that has cheap booze and a nice cafe.
7) We used a tour agency called Shearwater, good prices and good staff. Try book your stuff before the time as it may be hard to get hold of them when you there if your phone doesn't work.
8) Walk around and explore the little town. We went to the main hotel in the area and used their pool

They also had an all you can eat buffet dinner. Was quite pricey but so much choice which was great.
9) Try see the falls from both sides (Zim, Zambia).
10) Do the bridge tour, was quite cool unless you are afraid of heights as they take you to walk on the walkway under the bridge.