Luggage and bags: No bags in hot summer except one for your camera, good (safe) pockets (or comfortable belt) instead. Small city rucksack for warm winter.
Clothing/Shoes/Weather Gear: Light clothes (shorts, T-shirts, better too large :-) made of natural materials (cotton) for warm/hot days all year round.
Sweater/pullover and/or jacket for cold evenings/nights (from November till April).
Shoes? Oh, yes - you should have them :-). Sandals for walking and/or good walking shoes for trails around (dangerous reptiles and insects possible).
Add sun glasses.
Check the 10-day forecast for Yuma (46 miles = 74 km west of Tacna):
National Weather Service
Check the average weather conditions in Tacna in 1970 - 2000:U.S. Weather Station in Tacna
Toiletries and Medical Supplies: Good sun protection cosmetics with high UV filter - use them BEFORE or just after you leave your car.
Photo Equipment: Be prepared for large contrasts between sun and shadow - sun filters recommended. Add hmm... how do you call it in English - something fixed to your camera objective to protect it against sun - not comfortable to carry but necessary, I suppose.
Miscellaneous: Tourist frige with ice cubes and cold beverages inside :-).
Updated Aug 24, 2003
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Reviews and photos of Tacna attractions posted by real travelers and locals. The best tips for Tacna sightseeing.

No bags in hot summer except one for your camera, good (safe) pockets (or comfortable belt) instead. Small city rucksack for warm winter. Light clothes...
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Look at the above map of my itinerary in southern Arizona: 1 - Yuma - click here 2 - Tacna 3 - Stanfield - click here 4 - Marana - click here 5 - Saguaro Narional Park - click here 6 - Tucson - click...
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