Youngerthanspringtime, it's disappointing for you that your friend is unable to join you on holiday, I expect you were really looking forward to going and if I were you I'd go on my own.
Spending time sitting round the pool, reading, with the occasional dip to cool down and chat to people in the pool, would be a joy. Taking short walks, sitting outside a cafe with coffee and cake, bliss.
If you feel confident enough to go on your own, and you don't have mobility issues to hold you back, go! You'll have your meals cooked for you, no prep or washing up. Bed made, bathroom cleaned and towels replaced, evening entertainment or relax on your balcony, tea making facilities usually provided, safe and secure environment, people watching or chatting with guests.
Have a fabulous time ☀️ 🏖️ 🍷.