Hi Sue, I delayed my radiation due to family commitments. Is your trip more active or relaxing type? How long is your radiation? Mine was 4 weeks, shortened from 6. Have they discussed a shorter program? higher dose, but less weeks. I also had something planned for 2 weeks after and was fine with it. I did suffer fatigue initially, but acupuncturist got me sorted. If the Rad Onc is happy with you waiting I wouldn't worry. It's likely the radiation is a "just in case" to mop up any stray cancer cells, that are likely to be slow growing anyway. I did read somewhere that sometimes cancer can be growing for 4 years or more before a mammogram will pick it up! There are also lots of other articles which suggest that even thought the treatment plan seems rushed and in a hurry, that many people do have time on their side. Good luck with your decision. xx