What to Bring
Our guest room has its own bathroom stocked with towels, soap, shampoo, toothpaste. If you are particular about your brands then you should bring your own toiletries otherwise you are welcome to use what we have so you don't have to carry them along. We also have sunscreen and bug spray. Of course we have guidebooks so you don't need to worry about buying one or bringing it along unless that's what you want to peruse during the 24 hour flight! I recommend light, loose fitting clothes because you will sweat a lot. We have a pool in our building so bring your swimsuit. We also have a gym if you like to workout.
Visa Info
Basically the bottom line is, if you are just coming to visit for less than 30 days you don't have to do anything in advance. You will just get stamped at the airport, there shouldn't be a fee.
http://bangkok.usembassy.gov/services/visa/acs/thaivisainfo.htm
From this link you can access a guide for travelers that is put out by the Embassy http://bangkok.usembassy.gov/embassy/acs.htm
Weather
Basically it is hot and humid all the time and rains a lot. http://www.bbc.co.uk/weather/world/city_guides/results.shtml?tt=TT002890
Airport Info
We will discuss on a case-by-case basis getting from the airport to our house. Some visitors will probably want us to come to the airport in a taxi and bring them back. Others may feel up to just hopping in the taxi on their own. Regardless, here is some information about the airport just to have a sense of things.
Website http://www.bangkokairportonline.com/
Transportation http://www.bangkokairportonline.com/node/52
Departure Tax http://www.bangkokairportonline.com/node/66 (although our friends who already came to visit did not pay a fee when they left)
Tourist Attractions
I've linked to most of these through http://www.thailandguidebook.com Information can be found on these sites lots of other places, I just liked that the site is written by teenagers, so it's a quick, simple overview.
The Grand Palace and The Emerald Buddha (Wat Phra Kaew) http://www.thailandguidebook.com/palace1.html
The Marble Temple (Wat Benchamabophit) http://en.wikipedia.org/wiki/Wat_Benchamabophit
The Reclining Buddha (Wat Pho) http://www.thailandguidebook.com/watpho01.html
Erawan Shrine http://www.thailandguidebook.com/erawanshrine.html
City Pillar Shrine http://www.thailandguidebook.com/lakmuang.html
Victory Monument http://en.wikipedia.org/wiki/Victory_Monument_(Bangkok)
Lumpini Park http://203.155.220.217/office/ppdd/publicpark/english/mainpark/E_Lumpini.html
Jim Thompson's House and Museum http://www.jimthompsonhouse.com http://www.thailandguidebook.com/jthompson.html
Chinatown http://www.thailandguidebook.com/chinatown.html
Chatachek Market http://en.wikipedia.org/wiki/Chatuchak_weekend_market
Floating Market http://www.thailandguidebook.com/floatingmarket.html
Excursions
Ayutthaya/Bang Pa-in http://www.thailandguidebook.com/provinces/ayutthaya.html
Kanchanaburi and the Bridge over the River Kwai http://www.thailandguidebook.com/k_index.html
Koh Samui http://en.wikipedia.org/wiki/Koh_Samui
Phuket http://www.thailandguidebook.com/provinces/phuket.html
Health Information
http://www.mdtravelhealth.com/destinations/asia/bangkok.html
Medevac Insurance - Not sure that it is necessary (we have never done it) but it was something that was recommended to us by the medical staff here so we thought we should at least mention it.
Maps
Major Cities : http://ragustudio.com/ragu_assets/travel/thailand/thaimap.gif
Bangkok : http://www.bangkok-maps.com/