Visas can be obtained either at the entry (most likely at the airport) or at any Thai consulate.

Visa on Arrival can be extended for 90 days only in any 180 day periode. After the first 30 days have elapsed foreigners are free to take Visa runs to a border for a further 60 days (30 + 30 days).

These Visas can not be extended. After the 90 days have elapsed foreigners are free to take Visa runs to a border for a further 90 days (30 + 30 + 30 days) in any 180 days. 90 Days Visa are issued at any Thai consulate (most likely destination will be Penang in Cambodia).

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As of February 15, 2010: All passengers arriving in Thailand must have sufficient funds before entry is permitted, the Immigration Department says. Transit Visa holder:
Must hold minimum THB 10,000 per passenger or THB 20,000 per family. Tourist Visa holder:
Must hold minimum THB 20,000 per passenger or THB 40,000 per family. Visa on Arrival:
Must hold minimum THB 10,000 per passenger or THB 20,000 per family. Non Immigrant Visa holder:
Must hold minimum THB 20,000 per passenger or THB 40,000 per family. The above funds may be held in any permitted currency.

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As of June 01 2009: Thai Immigration Bureau has issued a new regulation. A foreigner who has entered the kingdom four (4) consecutive times on 15 days tourist exemption stamps, will not be allowed to leave the country and re-enter Thailand. The only option is to exit Thailand and re-enter via an international airport, which will allow a further 30 day stay. The new rules does not affect holders of visas issued abroad. Foreigners are advised to apply for a Tourist visas or Non-Immigrant visas at a Royal Thai Embassy or consulate outside Thailand instead of using the 15 day exemption rule.

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As of December 01 2008: There has been a change in immigration policy to restrict people from staying permanently in Thailand without a visa. Previously this was restricted by allowing 30 day entries to those without a visa. This could be repeated until a limit of 90 days of entries in a elapsed period of 6 months. The rules now seem to have changed to only 15 day entries being granted at land borders but at least there is no 90 day maximum. 30 days are still granted at airports.

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The Royal Thai consulate general in Penang, Malaysia, has indicated that officers there will now limit applications from foreigners applying to visit Thailand as tourists to just three 60 day visas.
Other Thai consulates and embassies in the region are unlikely to offer more generous visa extensions than Penang.

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Allows foreigners aged 50 (+ over) to extend an non-immigrant Visa for up to 12 month from the date of the last entry into Thailand. It requires either a 800'000 Baht in a Thai Bank or a combination of cash in the bank and proof of pension paid in the home country. Applicants have to use visa application form TM 7 and have to enclose their passport, a 4 x 6 cm photograph, 1,900 baht fee, proof of income (certificate of bank deposit and bank book savings account, or a fixed account for at least the last three months), and proof of an appropriate amount of money from abroad through the bank in a certain period of time, such as a certificate of transfer from abroad or copy of a banking transfer order. NEW: Applicants need to have an ATM card and a credit card. Legal spouses of Thai national require a minimum cash of 400'000 Baht in a Thai Bank. A relationship certificate approval with Thai translation certified by the embassy or consulate must be presented. Local immigration officers will also visit your home to verify that you really do live toghether as husband and wife.

Invest some of your money in a fixed-term deposit account. You can get a significant higher interest rate. Ask your bank for the best terms.

As a holder of a Retirement Visa you can apply for a Residence Certificate. It allows you to get your Thai Driving Licence, to buy a Motorcycle or a Car or to open a Bank Account on your very own name.