I'm second-guessing myself again (I do that a lot, in case you haven't noticed).

Is it OK to say something like:

Tiocfaidh mé do do theach amárach le haghaidh an lón

Or do I need to use "chuig" or "go dtí" or something else in place of the first "do"?

Redwolf

I don't know if I'm right, but I'd say something like

Tiocfaidh mé chuig do theach amárach fá choinne lón. or,

Tiocfaidh mé chuig do theach amárach le lón a bheith againn.

Ach, níl mé ach foghlaimeóir, amlaigh níl mé ró-cinnte.

le meas
Féabar

I'd say Tiocfaidh (rachaidh) mé go dtí/chuig do theach amárach le haghaidh an lóin

in Modern Irish you wouldn't use "do" in this case.
I think you may use "chuig" or "go dtí" (but normally not in Ulster in this case) or "chun" or you may use "toigh" (=to the house/in the house):

Tiocfaidh mé toigh s'agadsa amárach fá choinne 'n lóin.

or
Tiocfaidh mé (ch)un do thoí amárach fá choinne 'n lóin.

(after "le haghaidh" you'd have the genitive case too)

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

It looks a bit wrong to me, but then again I'm probably wrong : do do= for your, its often shortened to dod'

If I were to say this I would say:

Raghadsa/ tiocfadsa chun/ chum do thighe amáireach don lón/ le haghaidh an lóin

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Please wait for corrections/ more input from other forum members before acting on advice

I think they also use chuin in Munster in place of chun. True?

True, I'm not even sure they use "chun" in Corca Dhuibhne, if I remember well, 'Gaeilge Chorca Dhuibhne' only mentions "chuin".

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Munster Irish uses chuig or never?

Very rarely in the sense of "to the". But it is used in other contexts- Cad chuige srl...

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This is something I've been wondering. Munster Irish virtually never uses "chun" in the sense
"to the" as you said. However I've noticed it does use it sometimes in cases where there is another
particle in the why, like "do". Exactly as it is here "chun do". However normally you should use
go/go dtí. Do you happen to know when you use "chun" for "to (as in motion)" in Munster Irish?
I know it is very rare.

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal