Some resorts require nudity throughout their facilities, while others have specific areas that are clothing-optional. I've never been to a naturist resort.
Naturist resorts are pretty much the same as textile, or clothed resorts.
You will find water and land sports, restaurants, nightclubs, spas, and gyms. The only difference is that guests will not be wearing clothing. Believe it or not, it is very unlikely you will experience this. Nudity is not about sex, and you will find after awhile that you do not even notice that neither yourself or others are naked. However, if you do have this reaction, simply cover yourself with a towel, or turn over on your stomach until it passes.