How many are you?
One of the bettert ways to visit the Palace, Wat Pho, and other obvious sights, is by the Chao Phraya express boats. You can take the BTS skytrain to Saphan Taksin, and hop on an orange flag boat to pier 9, Tha Chang. Head inland, ignoring all the fools telling you everything is closed.Map from Pier to Entrance
You can also take the express boats to Nonthaburi, pier 30. Nonthaburi is a little more like the rest of Thailand. Not catering to the tourists so much. There is a free museum, and a little ways in, on the main road, there is a nifty open market.
You can have lunch at Rim Fung, a pretty good floating restaurant, just south of the pier.
Or, if you are up for an adventure in dining, you can head to one of my favorites, Baan Rabiang Nam.http://cheapeatsbangkok.com/photos/thai/rabiang_map.jpg
On weekends, from the Nonthaburi pier, there are Koh Kred trips offered. Koh Kred is a little island, famous for pottery.
You might enjoy a movie from one of Bangkok's "deluxe" seats:
Dinner cruises are fun. Two popular cruises are Loy Nava
Shoppers enjoy Chatuchak Weekend Market, billed as the World's biggest flea market. It operates Friday afternoon until Sunday.