I don't really have a specific dream of perfection, but if I was in a lucid right now I'd either -

Change the whole environment. Make it morning. An autumn morning with a royal blue, near crystal clear sky with but a few small wisps and a few plane trail. The leaves on the trees are orangey-red in the early morning sunshine. There is no wind or breeze, the air is still. All that can be heard is the early rising birds tweeting. I'm on a forrest walkwith the girl I really like and she's looking especially beautiful on the cold autumn morning wearing her fluffy scarf and gloves. We're walking a husky (dog I've always wanted).
We're holding hands as the dog runs ahead. Come across this chestnut cart selling roasted chestnuts. I hold her in my arms as the guy roasts them. We wonder into peaceful woods where there is nobody and we sit on a huge fallen tree trunk bridging over a small frozen stream while enjoying the chestnuts.

or

A south pacific group of islands with crystal clear water, white sand and palm trees up the coast. Me and some really good buddies are just laying there drinking chilled beers from our endless ice bucket of beer bottles. Someone pulls out a bag of weed and packs a pipe and passes it around. We just enjoy the whole principle of spawning anything we want. But when we all spawn beautiful native girls in bikinis to walk out from the treeline, we make more weed and beer and spawn a huge party round the corner on the beach with lots of people and girls and booze.

I dunno I'm sure I can think of way more imaginative things but I wanna hear what you guy's perfect dream is