I'm wondering if anybody could help me out by translating the quotes "remember who you are", "not all who wander are lost", and "a smooth sea never made a skillful sailor" into Irish Gaelic. I'd appreciate it. Thanks!

Here are some suggestions for the first two to get you started:

Cuimhnigh cé thú féin "Remember who you are"

Ní bhíonn gach fánaí ar strae "Not all who wander are lost"

For the third, a similar proverb that might work:

Is iomaí cor sa saol. literally "There is many a turn in life"

Await confirmation or correction or further suggestions, especially on the last one ...

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

Another couple of suggestions for the sailor sentence.

Ní dhéarna farraige chiúin bádóir oilte riamh.
A smooth sea never made a skilled boatman.

Bíonn gach fear ina ollamh maraí agus an mhuir ina clár.
Every man is a master mariner when the sea is calm.

I have a feeling something is wrong there somewhere, but someone with more knowledge will correct them, I hope.