Look at the list of possibilities below and decide which is the most important for you during the year. Many of us have several priorities which are almost on the same level - if so, try to look for programs which combine a bit of each. Hebrew study - This is called an Ulpan which really means studio. They usually last 6 months, whether on a kibbutz or in a major city. There is also a summer ulpan on a Kibbutz which is less expensive but not very serious when it comes to study.
Reality is a lot different.
Most Yeshivot are open and understanding frameworks which give you the opportunity to probe into who you are and what you want from life. One fact is important - if you don't like the program you're on you can just get up and leave. There are many yeshivot all over the country with many different philosophies suitable for every background. Most of the subjects are taught in English but if you speak some Hebrew you can take other courses as well. In addition, for those who want to pursue a degree there are the regular programs.