Please be very careful at the beach. This time of year the sun rays are so bad and the reflective light on the water and sand can cause lupus to flare bad.
I wish we had some of the old posts about this. Wear a hat, the strongest sunblock you can find, sunglasses, breathable clothes and stay under an umbrella if you on the beach during the day.
I know when you go to the beach you don't want to be all covered up under an umbrella, but we have to be very careful. I haven't been to the beach in a long time, but when I did go, I would do indoor things during the hotest part of the day and go to the water late in the evening when the sun is low.
I hope you will be able to have alot of fun, just make sure you take the proper precautions in the sun. Take care and let us know how your trip goes. You will be in my thoughts and prayers.