We took travelors checks, had no problems. But everyone in the Caribbean takes US dollars.
My son went to France and Spain on a school trip in June and everyone looked at me like I was crazy when I asked about taking travelers checks.
I was told "nobody uses travelers checks anymore". In this case it made more sense to use a debit or atm card, or a reloadable card like a Visa Buxx card.. My son was able to get the cash he needed anytime, in euros. Travelors checks would have to be cashed at a bank, or store. And I was able to monitor his spending from home on the internet, to see if he needed more money put on his card.
Mind you I sent him to France and Spain with $500, and he only spent $300. And almost all of that was meals. Interesting that all the GIRLS parents on the trip gave their daughters at least $2000 to spend.