tell me

I have an exam day after tomorrow. I have to study hard, but I hardly do that. Tomorrow, I’m going to meet my friend. We are going to buy birth day present to our friend. The friend’s birth day is tomorrow. We are going to give a present to her next Tuesday. I want her to be pleased. However, I don’t decide a present. She is going to go to Hawaii this summer. I want to give her something useful in Hawaii. What present do you give if you are position of me? Please tell me your idea. (98)