If you have a BTS station at your doorstep, the city is your oyster.
Terminal 21 is also i central thing to check (if you have wifey with you), can take the BTS 0r MRT there. Pedestrian connectins, etc. Great food court.
Then down to Asoks and a short cross over and walk down to ....
https://www.google.com/maps/dir/Benchakitti+Park,+Ratchadaphisek+Road,+Khlong+Toei,+Bangkok,+Thailand/Asok,+Kamphaeng+Phet+7+Rd,+Bang+Kapi,+Huai+Khwang,+Bangkok+10310,+Thailand/@13.7316419,100.5495213,15z/data=!3m1!4b1!4m14!4m13!1m5!1m1!1s0x30e29f1bbc1ff399:0x272f7997bda0bbf6!2m2!1d100.5587134!2d13.7295129!1m5!1m1!1s0x30e29ef1f0c56179:0x12b04663d38f032b!2m2!1d100.5603061!2d13.7370587!3e2?entry=ttu