Anything I should be aware of before I take my snake outside?

[stkkts]

I want to bring my ball python to the park. He has only been outside in the fresh air once, and I think he will enjoy it. Although last time he seemed extremely confused. In any case, should I be concerened about anything? Such as pesticides being used, or herbicides, or potential mites and other bugs? What sort of pre-field trip preperation should I take, and do I have to do any sort of decontamination afterwards?