The number one piece of advice is sunblock, sunblock, and more sunblock.  Don't even think of setting foot outside during the summer without being covered in the stuff.  Even a few minutes can leave you crispy.  Hats are a must too.  Beach umberllas can be rented on the beach from the lifeguard service but if you plan to stay several days it may be more economical to buy your own. For the cost of renting one day you can buy what you need for the week.  Small to medium sized umbrellas one can be purchased from one  of the many local beach shops or mega marts for around $10 and beach chairs for around $5. If your don't have the room to pack the chairs and umbrellas just donate them to a family checking in while you are checking out.  You will still have saved money and done a good deed too.  A quick tip to keep your umbrella from blowing away - tie one or two plastic shoping bags 1/4 filled with sand to the prongs at the top of the umbrella.

Most resturants are kid friendly and some even provide entertainment for the kids while you wait for a table. (Crabby Mikes is one).  If you don't enjoy long waits to be seated, go for an early supper.  After 6 pm the lines tend to get quite long.