How many people fit to sleep in a cabin and is there a shower in it?

2 or 4

There is room for cots and/ or air mattresses to be added, so it just depends on the ages/ sizes of the people in your group as to how many will fit. I would say 6 would fit. The website has pics of the inside of the cabin. https://tpwd.texas.gov/state-parks/lake-corpus-christi/fees-facilities/lodging There is no restroom or shower inside. There are restrooms and showers nearby to walk or drive to. There are parking spaces at the restroom/ shower facilities.

My mom and I rented one a few months back. 2 twin beds (surprisingly comfortable) and a table. Screen windows half way up all the way around so it got kinda cold at night.