"Try to avoid the busy weekends."
With the advent of social media a pleasant weekend and the cherry blossoms brings a flash mob.
If you must go on a weekend:
Do not drive. (I know such advice is redundant for many people on this forum.) Parking fines are $300+, and parking officials will be present. (Some people treat the parking fine as the price of admission.)
Pack it in, pack it out (park crews cannot make their way through the traffic to collect all the garbage as it accumulates).
Smile!