1) Look at a map: I use a combination of
http://www.routenet.nl/?language=GB (intended for driving but good for general browsing around) and
www.ov9292.nl (for public transport planning). From the former I can see that the direct route from Dam Sq to Park 118 is just over 2km - how fast do you walk?
2) No idea, suggest you look at recent reviews in the device.
3) I wouldn't bother with a taxi myself, public transport is much cheaper, but guess €20-25 and bear in mind you cannot hail a cab on the street so on your return you must find a cab rank or get the venue call one for you.
4) Depends on your tastes and stamina: it would get you overnight and a bit with a WotW or Elite escort or around 30 shots in the RLD.
As to why there have been no answers to your previous post perhaps:
1) Readers do not have experience of both agencies (I certainly don't)
2&3) Readers do not have experience of threesomes in both circumstances (I certainly don't)
4) did not seem like the main thrust of the post
B61