We have used the Visa travel money card on recent trips to Mexico and Jamaica. It's just like travelers checks but in the form of a Visa loadable card I think up to $5k.
But you can use it for everything from plane tickets to getting cash from the ATMs. Note: fees do apply on certain transactions.
We liked it because you only spend what you plan, you can leave most of your own cc's and debit cards at home and don't need the hassle/worry of carrying too much cash on vaca.
Prior to this I used to put cash into a beltlooped crotch wallet that was rather uncomfortable until the end of vacation when the money and my "gifted" appearance faded.
Here is a website with what sems to have the best fee structure. AMEX also has a card but I believe their fees were considerably higher. https://travelmoney.nationalcity.com/index.cfm