Well in character with stringing bead necklaces and crafting silver jewelry, you could reenact the spirit of the '60s, by making macrame plant hangers, stained glass, and leather accouterments . . .
. I'm only joking, since among other diversions, we did all those "hobbies' back in our hippie phase.
Seriously though, we live aboard in the summertime and do share Surfesq's opinion. If you love boats like us and you have an older boat, you will find that sailing often and simply messing around with maintenance and upgrades, will be enough enjoyment and is sure to take up much of your free time.