well for starters I would self-replicate a hundred times and throw a truly epic pity party for and with myself. But never one to dwell on the past nor fear the future, I would feed my replicants to the volcano gods of Io after a proper wallow and set out to make new adventures and memories while I still could.
I would leave this solar system behind to visit my old broodmates on Epsilon Eridani B. I would want to run my pseudopods through the sulfur springs one more time, and feel the solar radiation on my cilia whilst joyriding on a comet. I would down a pint of rocket fuel and howl at the demon stars Algol. I would take more spice than a Guild Navigator and grow a sexual organ for the express purpose of allowing a Bene Gesserit witch to imprint me. I would have one tentacle in a wormhole and another in the pink as the old saying goes. In a state of quantum excitation I would experiment with multi-dimensional orgasms. I would write my name in ten league letters across the surface of Pluto, dear Pluto, sweet Pluto, you will always be a planet to me. I would of course bring my towel.
Toward the end of my allotted Terran year I would record my memories on a crystal cube to pass on to my larvae, and once that task was complete I would take a heroic dose of mooncrystal and strip off my outer membranes and wander into the anticyclonic storms of Jupiter for one last hurrah.
So yeah, basically - the usual.