The title promises an enjoyable trip, but the poem describes something very different: climbing into a box to hide and fall asleep. The speaker calls this "my journey," and the gap between the cheerful title and the small, enclosed action is what makes the poem interesting. The journey is not outward. It is a retreat, a shrinking down into safety and sleep.
The second stanza takes the speaker somewhere stranger. They go to a place that is "out of place" in their own cellar, which the poem describes as full of "waters and hands." The cellar suggests the deep, hidden part of the mind, and the odd image of waters and hands could point to feelings that flood, or to memories that reach out. That reading is an inference, since the poem never explains it.
The mood is quiet, dreamlike, and a little uneasy. The speaker seems to find comfort in hiding, yet the title's "enjoying" may be ironic, or may be a way of insisting on calm.