Thanks to everyone who posted about my helmet dilemma. Many good points were raised and some I had not really considered before. To clarify, this would be riding a beach cruiser bike, single speed, slowly, mostly on unpaved roads or beaches, totally flat. But I could certainly be hit by a car when riding on the road, even though there are many fewer of them than on the US roads I ride.
I've actually been on web sites looking at urban helmets, which I think would be less conspicuous, but the problem that a couple folks alluded to is that they are barely vented, and Belize is hot and sunny. The ideal helmet would probably have many vents and be white, but also have a brim to help with the sunshine.
I agree with those who say that I should not attempt to convert the locals, and I won't. That's not my style, and attempting to bring in or import a boatload of helmets would be difficult in a third-world country as well. We'll be on an island, and helmets aren't even sold in stores there. I also think, like crankin's experience, that the locals might reject them out of course. It's just not part of their culture.
Yes, I know I'll look different even without a helmet, but wearing one just increases the level of perceived difference.
Shootingstar's point about medical care in case of an accident is a very important one. The medical care in Belize is fairly basic, and serious injuries could require a trip to Mexico or even back to the US. That might be reason enough to override all else and wear a helmet no matter what the down side.
Thank you all!
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow