Of course, the initial reaction for being on an island would depend on how you got there. Hopefully your not injured. Being injured would complicate things. A really bad injury may lead to death.
If you got there by swimming to safety from a damaged boat or something similar, then the initial reaction would be fear. Once you accepted the reality of it, you could settle down and begin to think things through. You would certainly have plenty of time to do that.
Now, if I was the kind of person that did not like being outside, there would be lots of problems.
Maybe someone that don't like being outside and someone that don't get pleasure from nature and the sounds that come from it would act, could write and tell us.