@Jim ********
visa exempt entries for Americans and 90+ other nationalities changed from 30 days to 60 days as of mid-July. There is no longer a need for getting a 60 day tourist visa. Just like with 60 day tourist visas, a 60 day visa exempt entry can be extended one time per entry for 30 additional days, thereby giving you 90 days stay. Just show up with your passport. Nothing else needed, although you could always be asked for proof of an onward ticket, proof of funds, or booked accommodations, as has always been the case, but it is highly unlikely for Americans to be asked for this.