As far as I know,wearing contact lenses when u go to beach is fairly harmful to ur eyes because of bacteria in the sea water.And Wind may bring sand into ur eye then cause trachoma even conjunctivitis.However,If u really don't want to wear a frame,wearing a pair of sunglasses outside isn't a bad choice.
I suggest you to wear the contact lenses to the beach because of the strong sun lights. You could also wear the sunglasses outside to protect the eyes from the uv rays and other bad lights. Thus your eyes will feel comfortable. You will get little possible to be red and dry at the eyes. You could have a try.
Well, in my opinion, you are supposed to wear glasses when you go to beach. And generally speaking, when you go to beach, it is easy for your eyes be infected by some bacteria and allergies in sea water. So if you wear contact lenses, it will just increase the risk of getting eye infection because contact lenses can just carry bacteria into your eyes. Anyway, just be careful about it.
It is better to wear a pair of glasses instead of wearing eye contact lenses. There are three main reasons. First of all, on the beach, the wind is usually strong, therefore, the sands and dust can be easily blown into the eyes. If you are wearing eye contacts, your eyes can be easily get infection from that. Secondly, if you are wearing eye contacts, your eyes can easily get dry, and on the beach, with the wind blowing and the sun radiation, the crystalline lenses needs more water and oxygen to keep metabolism, and the eye contacts can be a great obstacle. Thirdly, there are large amounts of bacteria in the sea water, and it is very easy for the eyes to infected if you are wearing eye contacts. In addition, it would be very inconvenient when you are wearing eye contacts on the beach. Therefore, on the beach wearing glasses will be much safer and more sanitary. Besides, it is even better if you wear sunglasses which can help screen the ultraviolet rays in the sunshine. As we all know, the ultraviolet rays are very harmful to the eyes, and the sunshine on the beach is usually very powerful. If you are nearsighted or farsighted, you can buy a pair of prescription sunglasses with the function of vision correction. You can refer to the following website for further information about prescription sunglasses.