“We’ll probably maintain a place in the US too so we can keep our citizenship here.”
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You can not loose your citizenship, other then by renouncing it.
Even my social security is direct deposited into my Philippine bank.
I have no property left in the US, and no intention of returning.
My passport was renewed through the US embassy in the Philippines.
I probably should have expanded a bit on that... keeping a place here also will serve as a base so-to-speak, where we can store some of our things, have a US address, etc. Shipping personal things (furniture, art, cars, etc.) into Costa Rica is prohibitively costly (heavy import duties).