Can someone please translate this for me.
"At the end of the day, I walk with the heart of a lion"

This is my attempt at it - but wait for confirmation from the others -

Ag deireadh an lae, siúlaim leis an croí leoin.

I'm not sure I'd translate the "I walk" part literally. Perhaps...

Ag deireadh an lae, tá chroí leoin ionam

But again, that's just conjecture. Wait for more input.

Redwolf

This works for me. No lenition of "croí" though.

But I'd go further and suggest you leave out "at the end of the day". I think that really needs some context to go before it.

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It is recommended that you always wait for three to agree on a translation.
I speak Connemara Irish, and my input will often reflect that.
I will do an mp3 file on request for short translations.
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RMcGeoy11,
As Redwolf alludes to, it's not clear what "at the end of the day" means in this context. Do you mean literally "when the sun goes down" or in the figurative "when all is said and done" sort of way?

Others,
Might the idea of the "internal" with here be better expressed by "nam bhrollach" (in my breast) or something? "I walk with a lion's heart in my breast".

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A language belongs to its native speakers, and when you speak it, you are a guest in their homes.
If you are not a good guest, you have no right to complain about receiving poor hospitality.

how would you just translate "Heart of a lion"

Irish doesn't have the indefinite article ("a"), so it's just croí leoin (heart of [a} lion").

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I'm not a native (or entirely fluent) speaker, so be sure to wait for confirmations/corrections, especially for tattoos.