Things to bring
If you bring a big camera bag-suggest you use a $7 cooler from Costco, no point in attracting attention.
If you have small portable binoculars, bring them, you will frequently have the chance to stop by the road to see monkeys, birds, etc.
Bring a National Geographic map of CR-avail at Borders, B$N. Roads are constantly getting better, so even if there is only a dirt track shown on the map, it is worth a try in many cases.
Things that are expensive-industrial made, imported and taxed-so cars, band-aids (sold one at a time), your shampoo, coolers!, cosmetics, brand name alcohol, sunscreen…all available but you can average down by bringing what you will need.