Hey there! Nice to know that TPR members are visiting Brazil!
Being in São Paulo is easy to go to Hopi Hari. The park is located about 40 minutes away from the city. By public transportation is almost impossible to get there, but you will find a bus service that takes people from São Paulo's principal shooping malls and metro stations to the park. You will pay about R$15,00 ($6,00) for the bus, R$42,00 ($16,00) to the park entrance and you will spend like $6,00 with food... The bus leaves São Paulo about 9 AM and returns to the shopping malls and metro stations about 8 PM during the week and 10 PM during weekends and vacation.
To visit Intamin 8 Looper is a little harder. You will need to get a bus or plane ticket. Rio de Janeiro is about 600-700km from São Paulo! I've never been there. Hopefuly we'll have a TPR member from Rio that will be able to help you with this trip!
Feel free to contact me, I'll be pleased to help you to plan your Hopi Hari visit!
João