Hi Julie. I would encourage you to make sure you up your water intake which will be an added benefit to what you are already doing. Also being sensible like covering up (especially the burnable areas like top of head, shoulders, feet) during the hottest few hours of the day and have rest days from the sun.
You don't mention what Vit E cream you are using but I would apply that immediately after sun exposure and get some aloe vera gel which is good for sunburn. If you start to go red cover up rather than topping up the suncream.
Most of all have fun.