When camping, and during other outdoor activities, a table can be quite handy to have as a surface for eating or playing games on. But when you are having a picnic or lounging on the beach, you will probably be sitting on the ground (or on the sand). That is why whatever type of table you bring should be a low one. With a low surface, you can use the table without having to bend down uncomfortably to reach whatever is placed on it.
I like the look of this one:
Low camping table pictured: Picnic Plus Roll Up Table
Of course, if you prefer sitting on chairs, you may want to get a higher table.