Southern Brazil (coming from Ciudad del Este / Paraguay)
 

Recommended guidebook and maps from QuatroRodas, (one can buy them in big filling stations),

Entrance formalities at the end of the bridge over Parana river, extremely friendly, 90 days, apparently renewable

Campsites in Foz de Iguazu:
Camping Internacional, S 25°33,564' W 54°34,572', next to City, very clean, acceptable restaurant
Youth hostel Paudimar Campestre (along the road to the Brazilian side of the falls) (S25 35.945 W54 31.467)
Camping next to the entrance of the falls, in the jungle (good shade, but humid) S 25°36.672 W 054°28.590

Parking in Curitiba, downtown under the trees of Praca 29 de Marco, safe and quiet, S 25°25.646 W 049°18.136

Parking in Martinos, safe, on the beach S 25°48.441 W 048°31.797

Parking in Penha, on the beach S 26°44.076 W 048°.40.824

In southern Brazil safety never was an issue

Exit formalities to Uruguay: easy.
Temporary import permit in Urugay: 365 days

Have a safe trip
Albert