Ushuaia is a fairly safe city, but take common-sense measures against thievery and such. The weather is changeable, even in summer. When going hiking or on another outing, bring raingear and warm clothing. Protect yourself from the sun (glasses, sun block), particularly in summer when sunlight lasts almost 18 hours. The ozone layer is thin here. Outbreaks of marea roja (red tide, a deadly nerve toxin) may affect shellfish. Be aware of any official warnings. When choosing lodging, guides or other services, use only licensed services to avoid rip-offs. Direct any complaints to the tourism office (San Martín 674, Tel.: 42-4550, E-mail: muniush@speedy.com.ar).