Is it safe to go to the beach 6 weeks after a breast lift and implant?

If healing has been uneventful, as it is the vast majority of the time, after breast lift and augmentation, then going to the beach or swimming pool 3 week after these procedures is usually just fine. Certainly, at 6 weeks you should be fine swimming. 

6 weeks after surgery you should be back to most normal activities including a beach trip. This assumes that you have had normal healing and no problems. You should still be a little careful with your breasts. Clear all this through your surgeon. Good luck.

It's always a good idea to check with your surgeon about his or her protocol. After I've examined my patients and feel satisfied that their incision is healed enough, I tell them they can safely go to the beach. Often, that's three weeks after their surgery. You're right about sunscreen: Be sure to protect your incisions with sunscreen that has a sun protection factor (SPF) of 15 or higher. Ultraviolet light, whether from a tanning bed or the sun at the beach, can make a scar redder for a longer period of time. For more information on this and similar topics, I recommend a plastic surgery Q&A book like "The Scoop On Breasts: A Plastic Surgeon Busts the Myths." Have a great trip.