Experience often used to refer to a general thing.... "I have experience with computers". This does not refer to any event or activity.

I have experience traveling in Bangkok. (very general)

Experiences usually refers to specific things...."I have had bad experiences with that computer". I am thinking about specific events.

I have had good experiences in Bangkok. (I am thinking about specific events).

Examples:

That was the best experience of my life...

OR

I have had many great life experiences...

Sorry, I meant Bangkok 

Sure, but I'd probably say, "ive had different experiences traveling through Thailand."

Is it possible to use "I have experiences on traveling in Bangkok"?