Stacey,
For an overnight trip going stove-less will work, unless you want the comfort of hot drinks in the morning. If you bring a stove, use one that you have experience using, so that you don't end up frustrated trying to use one that is new to you (like an alcohol stove).
Down or synthetic sleeping bags? Either. Down is lighter.
Bring a bear canister that is large enough for all your food, including any items that smell nice and attractive to bears; like cosmetics.
Share the tent.
Bring insect repellant! In July you will probably encounter mosquitos. Others might claim you won't need it, but better be safe than sorry.
Sunscreen and sun hat - mandatory.
Check the weather forecast and bring rain gear if the forecast indicates the chance of rain.
Other than all that, bring energy!
