The sky will be there forever. You will find it can be lots of fun getting to know all the objects in the sky, and how to use instruments.
Things to know in the sky, for anybody with OK vision. Each of these items has the potential for hours of discussion, and repeated visits are a good idea
The Moon, phases and motion
Named navigational stars
RA and Dec, alt-az coordinates
Milky Way, zodiacal light
Predicting appearances of Ir flares and other human-launched objects
Mercury and Venus
Mars surface features and retrograde motion
Jupiter and Saturn
Uranus and Neptune
Oppositions and conjunctions
Minor and dwarf planets
Dark and reflection nebulae
Supernova remnants and planetary nebulae
Open or galactic star clusters
Algol and variable stars
Albireo and pretty double stars
Useful tools for optical observing, and things to know about telescope systems.
Paper and electronic charts
Light paths: refractor, reflector, Cassegrainian, Maksutov
Mounting systems: equatorial with a wedge, alt-az, computer controlled
Tripods, rocker boxes
Field of view
Finder scopes and devices
Digital setting circles do push-to
Goto still requires knowledge
I-products as controllers
Optimizing your scope—visit the ASEM ATM SIG meetings
Connecting cameras to scopes—visit an ASEM Imaging SIG meeting
Viewing with others—visit an ASEM Observer’s meeting
Stuff to investigate on a cloudy night, roaming the Internet.
Was Kepler’s Mom a witch?
Is faster than light possible?
How do we know how far away something is?
What is spectroscopy?
How do we know a star’s temperature?
Is http://www.zooniverse.org a fun place?
What’s a pulsar?
What’s a black hole?
Can you build your own radio telescope?
Who is Halton Arp and why is he such a trouble maker?
Antimatter is not the same as dark matter
Which is a bigger concern for us on Earth: when the Sun expands as a red giant, or when the Milky Way gets gravitationally messed-up by the Andromeda Galaxy?
And much, much more…