Sure. All good.

Feeling motivated by Bob's comment I add a litlle. Bob's comment is interesting. With my lesser experience of life, I have no problem with the expressions you use. Also British, rather than American English. :) So, just a comment, not any full-on ammendment or anything. . My answer was brief, not because I was being lazy; Just liked what you wrote. Native speaker of New Zealand English.

Thank you very much Bob.

Hi Hamid. I don't know if any grammar rules are broken in your statement, but I think most of us native English (American) would not say it that way. I think that we almost always include a subject (and not assume), and have not heard "full-on immersive few days" in my 75 years of life! I would say the first sentence as: I am feeling nourished and grateful for being able to spend a few days in the national park.