Become a Dragon Rider. Get your own dragon, fly on it, and keep the peace. 
(I think I’ve been reading too many fantasy books 
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This is a big idea in Carlos Castaneda’s books. It might also work as a skill to be practiced during this month’s moon quest. (click here).
As for substances in a dream, I’ve drank beer. I also assure you all that I am indeed 19 years of age (legal drinking age here in Canada) … also over 21, since this is international. 
You get what you expect to get in dreams, so I’d say that you would absolutely feel the effects. I imagine that someone who hasn’t experienced the true effect of something may have the SC make something up for them. To tell you the truth, I didn’t like being drunk in my LD, it sorta defeated the purpose and felt like low-lucidity.
Click here to read my Drunk Dream.
Yaay! 
Try eating something that tastes blue! Preferably if it’s also salty! Blue tastes fantastic! 
Dismember yourself and move your parts independently 
Imagine, seeing your body with your severed head!
What if in our lucid dreams we go to the future and see if theres a cure for cancer or something. You never know
Or perhaps we could go back in time and have a conversation with our favourite deceased person and discuss what the afterlife is like.
O_o if you went back in time the deceased person would be alive, thus wouldn’t know how the afterlife is, I suppose…
good idea.
I had one lucid like this once. not my head but i was staring at my hands to try and stabalize my dream and as i was moving my hands i realized that my right hand was not attached to my body. in fact i was holding this hand with my actual right dream hand, but untill that point i had been thinking that it was my actual dream hand. it was pretty suprizing and i dropped it. as it was laying on the floor i still had complete control of it and could feel with it as well as my other 2 hands that were where they were supposed to be. so try removing some body parts painlessly or growing some extra limbs.
Find out more about your inner self?
I have a hard one.
Build your own dreamworld, and re-enter it every dream. This would also be helpful for lucidity in general.
I have a dreamworld on paper, and I have been trying to create it in a dream.
Beat the heck out of yourself. I mean, clone you, then see what you don’t like about yourself and beat the heck out of your clone
Or just beat yourself, it’d be interesting to see the results of a LD beating 
Another one! Non-orthodoxal ways of doing things! Why fly like superman when you can float yourself like a baloon?
This could be better explained as a quest to use creativity to change things you do normally Why walk thru walls? You can make them open for you! Etc etc etc
You mean, like, advanced manipulation, Rodrigo?
Making a new world is best. For example magic world and hogwarts school…
Have I ever suggested just walking up to DCs and asking them to tell you something? You know, like just walk up to someone on the street and say, “Sing me a song” or “Tell me a story.” I’ve always wanted to do that, just to see what I get.
How about asking someone who will win the world cup and by how much? How freaky would it be if your DC was correct 
Record a song inside a personal studio?
Go on a killing spree in a fantasy land, and try not to let the dream turn into a nightmare.
(I did this once, but not in a ludic dream, ended waking up annoyed and slightly scared)
Bonus Quest: Kill your biggest fear (e.g. spider, ghost)
Direct a movie-like scenario?
Maybe a quest about exploring a dungeon and claiming the treasure would be good. It would test your fear resistence too. 
Achieve great pleasure?