Air conditioned bus from Pattaya to Bangkok (Ekamai bus station) is only around 115 baht for the 2 or 2.5 hour ride. This bus station is right near the Skytrain route. You might be able to do a tour on your own.
There are lots of travel agents who offer tours to many places, Bangkok is one of them. Find the nearest travel agency to your hotel and check out their selection book. Check a couple more travel agencies to see if one is any better than the others and choose the company you like. Most of these tours are “shared van rides” where other tourists are with you. Private tours can be arranged too but at a higher price.
I have been in and out of Thailand for many years and have yet to be screwed on buying a tour or buying a plane ticket!
Have fun.

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