You can do this no problem!
My go to for this kind of trip tends to be items I can easily dress up or down. I am a curvy (fat) size 16/18 Apple, bronde balayage hair and pale skin.
Early morning flight out Hush wide leg navy jersey trousers, white T-shirt, denim jacket, sandals and pashmina (turns into a pillow/blanket for flight). I pack socks just in case. Easy to ditch jacket on arrival. I take a small backpack with a cross body bag inside it so I have options for when I’m there.
Day 1 - swap trousers for denim shorts and add sun hat.
Night 1 - black linen dress, wedge espadrilles with big earrings and clutch bag.
Day 2 - black linen dress again, flat sandals you wore the day before, cross body bag and sun hat.
Night 2 - navy chino shorts, silk top/blouse, espadrilles and clutch with layering necklaces and simple earrings.
Day 3 - chino shorts again but with lightweight white blouse tied up and flat sandals, cross body bag and sun hat.
Night 3 - lightweight shirt dress, espadrilles, cross body bag and big earrings.
Day 4 - swim/use yesterdays blouse as a cover up OR denim shorts with T-shirt or vest and flat sandals/sun hat.
Option of jersey trousers for late flight home comfort.
Pack;
Swimwear if hotel has a pool/beach city like Barcelona
Black linen loose fit dress
Lightweight shirt dress
Denim shorts
Navy chino shorts
White lightweight blouse (doubles as a pool cover up)
Cream silk top or blouse
T-shirt or vest top
Espadrille wedges
Clutch bag
Straw hat
Nightwear
Underwear
Few pieces of inexpensive jewellery
Hair ties
Be smart with your make up etc too - ie. Chanel lip to cheek is a good multi product.