Lot's of options around once you've covered the temples.....At night, lit up they take on a different dimension.... There's some good hotels by the river....One, I know for sure) has karaoke rooms. with wait service.... If you're with a group it can be fun....Away from the temples there's not a "strolling" area that I've found....Maybe I just didn't find it..... There's a popular floating market there that seems more legit than the recently constructed tourist traps nearer to Bangkok....They did have some stage shows, but it's been awhile since we were there....
If you have your own transportation it will be a bonus.....
Sukothai sp? And it's other nearby world heritage site might be an option for your next trip....A lot more intimate with a lot less concrete but pretty comparable.....