Free/cheap stuff in/around Ocean City, MD?

Free/cheap stuff in/around Ocean City, MD?

We're going to Ocean City, MD next week. So far, the only cost we have is gas getting to and from. A friend is letting us use his condo for free, and we're bringing food and not eating out anywhere. Besides the beach (and I'm assuming there's a pool @ the condo), does anyone know of free/really (really) cheap stuff in the area to do/see? We = myself and my husband (in our 20's), our six month old son, my mother, and my 13 year old sister...so we're looking for things good for a wide age-range. :) I haven't been to Ocean City in over five years, I've heard it's been built up a lot. Any suggestions are appreciated. :)
My bedroom in the house

My bedroom in the house

love this community!

love this community!

sad plants

sad plants

My Room, again.

My Room, again.

My Azaleas are blooming..

My Azaleas are blooming..

My room :)

My room :)