Tarantulas cause burning and itching and maybe a paralysis, but they are never deadly. You need a lot of bad luck to get damaged from one of these insects. And even if it a snake will bite you, there is a big chance that it is not poisonous. They bite only for defense reasons. Note time of first aid as well as size and colour of the snake Steps like sucking, burning or ice on the wound bring complications why we can not recommend them.
Scorpions are night hunters.
They are very sensitive to sun radiation and would die after a short while. This is why they hide during day under stones or in caves. After sunset they leave their home and go hunting for food. Never walk barefoot at night. If you are outdoors, use good and high shoes.