Countless things to go after. Some straightforward, some esoteric, some ridiculously challenging, like making contact with 100+ 1x2 degree grid squares via 1.2GHz Earth-Moon-Earth ("moonbounce") -- that will take some effort, I guarantee.

My thing is HF contesting. Scratch building antennas is also a kick.

If you are interested in radio, find a club. They will help you get oriented.