Always cover your scars. Total sunblock and try and cover them with a bikini top. If not they’ll burn like hell!
Keep well hydrated on holiday. Remember your body is recovering from a major operation so it’s working overtime to keep you well. Give it a helping hand with extra fruit at breakfast since your on holz 
Depending on how long you wait after your op till your holiday. Make sure you don’t go in the pool until your scars are fully closed/healed.
Take it easy on the alcohol, especially if your on medication. You shouldn’t drink at all until you’ve finished your course of anti biotics.
Apart from that. Enjoy!
xx