<h2>Peaceful</h2><h3>(Or a word similar to that!)</h3><h3 />
Let's use POE, or process of elimination.
It's not really happy, there are no key words showing that it is.
It is not sad, although it may seem like it, the context is incorrect.
If you read this or were witnessing this first person, you would feel pretty calm. The sound of waves washing over, etc.