I think at 2/4 if you make a habit of calling large river bets you will go broke a lot of the time.
I also think you should develop a 3 bet or fold for SB so you are not paying rake every time you see the flop. Peter Clarke has a video, I think, or check out his web site for some ideas about linear ranges.
Summary would be 3 bet preflop in SB with these speculative hands and then you don't need to worry so much about all the rubbish in recreational's range.
Other summary - bad run out and he probably has it, good fold! :)

good fold

Yes its a good board to bluff, but think about which hands need to be turned into bluffs and what the average players do with these hands at your stake. Basically opponent has to be turning some made hands into bluffs here, which most people wont do and are happily checking back river.