Ray and I spent a week at the Penisula Hotel in 2006 and loved it. Their breakfasts were awesome with so many fruits I had never even seen before. The dining room manager would explain them to me and even prepare them for me to taste.All were great now I even buy them at home.
The pool is like something out of a movie.

We used their elegant teak boats(free) to cross over to the other side of the river to catch the riverboats to get to various places.Loved the armchairs to sit in for the 2 minute ride.

First thing we did was call Marty"s who sent a car to pick us up to go to his tailoring shop.
They were excellent and had everything done in 4 days. They have a website.

Peninsula had a car to pick us up at the airport and arranged for a car and guide to take us all over to such places as the floating markets and the River Kwai,etc.

we had lunches across the river at the Oriental Hotel which was equally impressive.

If you want you can take the local boat to the Royal palace and once inside hire a local guide(registered) . Ours was so knowledgeable.

Hope this helps a bit in choosing Peninsula