There is a digital map you can download on entry.

Rain doesnt get a refund on regular tickets. I would assume the same holds for SRVs. I have seen a number of youtubers visit during rain and they never mention getting refunds but I cannot cite personal experience as Im just a regular visitor to Singapore not a resident. Try it and report the result would be my other answer.

Around $35 US dollar. Including night safari. Very hot and humid make sure just wear light clothes especially walking for hours. Buy your ticket online coz maybe too crowded, to make sure and to avoid the long line. Enjoy and have a fun trip.

Taxis in Singapore are safe, reliable and reasonable in pricing. You may take a shuttle bus from Khatib MRT station directly to the zoo or book the Mandai express if you are going to the zoo on weekends and public holidays. However my suggestion is to take a taxi back after a whole day of walking and exploring. Tickets to both the Parks can be purchased in a combo set from the zoo website. You get a 20% discount if your purchase it online. Enjoy your trip!

Singapore Zoo and River Safari share taxi drop off point. When the pandas first arrived but the River Safari wasn't fully constructed you could enter the panda enclosure from the Zoo (it backs onto what used to be Inuka's enclosure. So they are right next to each other. Takes a couple of minutes to walk from gate to gate. I personally would have to rush to fit both in a day and give up shows etc so I tend to pair the River Safari as an afternoon before the Night Safari myself rather than the Zoo....light morning so you dont get tired and they work together.

Use a taxi, it is the easiest way

It all depends on the weather that day. If it is cool and breezy, your 3 years' old will be able to endure better. If it is warm and muggy ,then your 3 years' old is likely to become cranky as the hours progress. Having said that, the Zoo has a lots to offer.Check out the feeding time of specific species and be at that enclosure to appreciate their behaviours. The Night safari is a very different experience. As it will be long day, use the riders to get to different enclosures and pace yourselves. Baby pushers are available. Carry your umbrellas and water.

Definitely! I saw many young families with kids in strollers or pull along wagons. If you are unsure, just email them first.

You can either do only the zoo or zoo with safari. Just need to manage your time. If you do wish to do both, go early to the zoo (like the moment it open), spend about 1/2 a day there (until about 1pm then move over to river safari. You should have enough time for both though may be a little less liberty to linger in any one spot for too long. Definitely will allow you to catch all the shows - do have to check the timing of the shows and manage your schedule well.

Please download grab app and book a taxi, which is very cheap and best just like Uber. Sorry about the buses I have no idea.