Hello

So I was wondering what the most amount of guests people have ever had in their parks.

Mine always seem a little low so the parks become a bit quiet the more I build

Over 4,000 in one of my biggest parks. About 1,000 in my Fun Fairs.

about 3,500 was my largest amount ever (so far anyway)

Lol, I seen a YouTube video where there were 35,000 + guests in one single park.

I have seen that video as well. It's pretty cool.

As for the most peeps that I have had in a park, it would be a little over 4,000.

I wish you could design your own park size, as in make it larger.

I wish you could design your own park size, as in make it larger.

You can. Go to scenario editor and drag the map size out to what you want. The maximum size is 254x254, not 256x256 like RCT2 because the RCT3 game engine reserves one tile around the border of your park in case you want a fence around your park.
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The most guests I've had in a park was 8,000. That was my first RCT3 park and was the default 128x128 tiles with no CS. I wish I had kept a copy of that park because it had in it the busiest swimming pool I've ever built.

How do you encourage more guests?

I have a high rating, rides, shops, food and I advertise but the increase in guests is slow.

It's a custom scenario so it has 200% guest generation as well

I wish you could design your own park size, as in make it larger.

You can. Go to scenario editor and drag the map size out to what you want. The maximum size is 254x254, not 256x256 like RCT2 because the RCT3 game engine reserves one tile around the border of your park in case you want a fence around your park.
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The most guests I've had in a park was 8,000. That was my first RCT3 park and was the default 128x128 tiles with no CS. I wish I had kept a copy of that park because it had in it the busiest swimming pool I've ever built.

I know that, I mean even bigger than that.

The bigger the better.