To answer your question:
Famous foods- Tom Yum Goong, Som Tam, & Pad Thai
(if you do not know what they are google them)
Best Tourist Spots - Wat Phrakeaw & the Royal Palace, Khao San Rd backpacker hangout, Wat Arun, & Wat Po,
The Bridge over River Quai (the so-called Death Railroad), Erawan National Park, Lumpini Stadium (for Muay Thai kickboxing), the town called Pai
Famous celebs - Tiger Woods (his mom is Thai), Tata Young, Pancake, Miss Universe a couple years ago was 1/2 Thai (I think Natalie something), Thaksin Shinawatra, & of course HM the King. All of these are famous Thai folks.