The nearest one would be fireflies watching at kampung kuantan, kuala selangor. Just one hour drive from shah alam. They'll bring you on a sampan at a mangrove site for the spectacular fireflies watching. It'll be a breathtaking moment for you and your partner. So calm and quiet.
I always read kinkybluefairy post about awanmulan. Maybe you should give it a try. Here's her post about it http://www.kinkybluefairy.net/category/travel/malaysia/seremban/But I've read your blog for a while now, I know you prefer beach or adventurous holiday. So maybe a quick trip to PD will do you justice. Or further to Taman Negara pahang.
What about exercising your legs by stepping up some stairs whilst your eyeballs capturing an incredible limestone cave named Gua Tempurung? Have you been there? If not, try it :)
Cuba discover the magical of Belum Rainforest in Grik Perak. I ve posted my experience here http://travelistah.blogspot.com/2011/07/lipstick-jungle-getaway.htmlenjoy ur next vacay!
Go white water rafting! So much fun!
Try some jungle concept weekend retreat. :)http://www.tanah-aina.com/http://www.thedusun.com.my/