Wouldn't a main entrance on Universal Blvd lead to terrible traffic? I agree with the above poster that Kirkman / Sand Lake will be a much, much better place to funnel most vehicular traffic. It doesn't make sense to me to have the entrance on "Universal Blvd" just because it's iconic, though I'm sure there will be an entrance there.
Then, for 'fixed transportation', why not connect through the northern edge of Site #2? You'd only need to buy up one or two properties for a ROW between Site #2 and W&W (after using most of the median of Kirkman).
To me, the best bet is an airport-like PeopleMover on an elevated track, or even a Personal Rapid Transit like in Morgantown, WV that services WVU. Ridership and route length would be very similar.. ~3 miles, 4-5 stations, and probably ~10-20k daily ridership. The advantage of a PRT is that you could have more flexibility in routing, e.g. run a number of "Pods" direct from CityWalk 1 to CityWalk 2 while having other "Pods" run local routes stopping at parking, hotels, etc.
Edit: and I'll just add that a tunnel is almost certaintly out of the question. The "Boring Company" has done 0 innovation; right now Elon's projected cost reduction just involves smaller tunnels. The most expensive component of subway construction is always the stations, anyway. For a 2-3 mile system in a place with few utilities in the way but complicated geology, you'd still probably spend a couple billion on the network.