All of the above, and usually you will need at least a two layer board to stand much chance, your loop areas will just be too big on a single layer design.
Physically smaller components (especially caps!) are better at high frequency, there is much to be said for 0603 or 0402 instead of anything with leads.
Note that by the time you hit 1.9GHz, the parasitic behaviour of components is in play bigtime if you are not careful, and every component looks like an inductor (except inductors that look like capacitors!).
Regards, Dan.