Can you please guide us? Sightseeing and shopping in Singapore?

I and my friends are planning a trip in Singapore 5 days in next month. This will be our first trip in Singapore. Can you please guide us in sightseeing and shopping ?

Thanks so much

Get a good guidebook -for example from Lonely Planet!

Hi,
I guess this site will help you:
yoursingapore.com/en.html

Regards!

Gardens by the Bay
Gardens by the Bay are a welcome addition to the Marina Bay land reclamation project. Stroll around for free, but the two conservatories, Flower Dome and Cloud Forest, are worth paying for. The views from the aerial walkway over Marina Bay Sands hotel, Singapore Flyer and ArtScience Museum are stunning.

Opening Times: Outdoor gardens: Mon-Sun 0500-0200, conservatories and OCBC Skyway 0900-2100 (last sale 2000, last admission 2030)
Admission Fees: No (except for conservatories)
Disabled Access: Yes
Unesco: No
Address: 18 Marina Gardens Drive, Marina Bay, Singapore, 018953, Singapore
Telephone: +65 6420 6848.
gardensbythebay.com.sg