Chinese garden and Japanese garden if they are convenient for you. The trees there are quite low, so it is quite easy to get relatively close to birds.
I have seen oriental pied hornbills, pied fantail, magpie robins, sunbirds, little egrets, herons, tailorbirds, collared kf, stock-billed kf, yellow bitten, flameback, shrikes, barbets, white-bellied eagle...
For me, I have just started, so these are sufficient to keep me entertained. I am using 55-300mm too.