Best Irish bank for USA use ?

If it was me I'd bring my gambling and walking around money in cash, use card for the rest, Revolut I'd recommend.

ATM's in Vegas charge crazy fees, $5-$10 per withdrawal no matter who you bank with or how much you are taking out, best avoided at all costs.

Yes Allegiant is, I think The Sphere too.

OK, it depends on three things;

1. The hotel you are staying in
2. How much we are talking about
3. What activities you will be getting up to

If you are staying in a sawdust joint your chance of having your room robbed by staff is a little higher.

If you are bringing people back to your room (professionally or amateurly) you are at risk of getting trickrolled, especially if you wear a luxury watch.

If you are getting very drunk while gambling and with friends who abandon you and staying in a sawdust joint and staying out super late you are at a small risk of getting followed and robbed.

Trade Republic card has zero FX fees including weekends.

T212 card has minimal FX fees of 0.15%.