"Everywhere" as 到处都 or 到处都是
到处是 can be used interchangeably as 到处都是 and they means something exist everywere.

For example, 菜园里到处都是蘑菇 means mushrooms are everywhere in the garden.

Sometimes, 都 gives significance to the sentence, it emphasis that this specific place is unique as it has a specific object everywhere. 

For example, 海里到处是水! means Ocean has water(which is a fact about ocean)
whereas if you say: 家里到处都是水 meaning there is water everywhere at home. You see that it is uncommon. 

是means to be. So if you wish to use another verb with everywhere, you should remove 是 and replace it with a verb that you want to use。

Example: 到处跳舞： Dance Everywhere.
到处逛： Wandering Everywhere。

Hope That help.