Summer riddles

What passes under the sun but makes no shadow?

What dresses for summer and sheds in the winter?

Why is ice cream always invited to the party?

What do you call a dog on the beach in summer?

What shoots up when the rain comes down?

What travels all the way around the world but always stays in one spot?

What is brown, hairy and spends all of its time on the beach?

What comes once a day but leaves every morning?

I can make castles but l I am not a brick. I often get into your food if you have a picnic. What am I?

What is full of lots of holes, but can still hold water?

Which tree can fit inside in your hand?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Which day of the week is best to go to the beach?