Actually it makes less sense to try to integrate all the domains into one because parts of domains can be used as important keywords to the website and could give you a better ranking.
What I would suggest to create a close integration is to make sub domains as follows:
camp.example.com
media.example.com
Then talk about the word in the sub domain name. For example, for camp.example.com, talk about camp often.
The other way is to just use one domain and redirect any request from the remaining domains to the one domain you want. If you do this, then you should use folders for categories. For example. http://example.com/camp and http://example.com/media.
