You can tan or go tanning in your hair extensions.  Tanning beds are no problem at all while wearing the extensions.  If you are tanning in the direct sun should follow the hot, direct heat suggestions below. 

Yes, you can swim in your hair extensions; the ocean, natural salt pools or chlorine pools will not harm your hair or the extensions.  I would abstain from keeping you bonds wet for many hours at a time. A maximum of a few hours of water on the bonds is recommended. Anything beyond this could allow the hair to shed a bit. Swimming here and there or sitting in a hot tub will not harm your bonds. Just let them dry completely before brushing, pulling or tugging on them. A loose braid is recommended for swimming.  If you’re going to be diving in the ocean a swim cap is a great idea.  Be sure to follow the cleansing and care tips and instructions for these activities.

Sunning in your hair extensions

While in high heat (100+ degrees) you won’t want to pull or tug at the extensions, but they aren’t going to fall out in high heat by themselves. They will come out in high heat/beating sun if you pull them out. You should carefully wait until you have returned to a cooler temp (70′) before pulling or combing your extensions.

Your hair should be completely dry before brushing after washing or swimming to let the bond dry but mainly for the safety of pulling on your natural hair.