Depending on where she / he is going, scented candles are nice. A light sweater is often needed for air conditioned buses, cafes and business places. Like the beer, Dominicans like A/C at the nth degree.
Depending again on what the person is going to do-tourist or work in the countryside as a volunteer, a light cotton fleece blanket might be appreciated. I know it was my most prized possession for a few years! After 110F in the daytime 70 degrees at night is cold!
The radio idea is a good one. For lengthy stays it helps keep things in perspective...A Zenith Transceanic is what I have...
Shower flipflops are a must. In the tropics nobody should walk barefoot, at any time...
Thick cotton socks, athletic socks, are important to keep your feet dry...Good, comfortable shoes-closed...Leave the open toed ones for party-time.
Cotton undies are better than Victoria's Secret.
More long jeans than cutoffs.
Khakis are neat.
One "nice"outfit for special stuff...
What you would call a "First Aid Kit": Anti-biotic creme; alcohol swabs, Band Aids, Tylenol, Best cough syrup available; Anti-histamine lotion for itches (Calamine?), Anti-diarria pills or liquids.
First Aid pamflet.
HB
YOu can e-mail me with her 20, or I can send you my numbers....