1500 Guests in 2 years with 10k starting money (minus ~3.5k for a depot / transport tube), an okay-ish selection of roller coasters and very limited high intensity thrill rides (Twister, but that doesn't count for much), no drink shop except for vending machine (but no customizable shop) makes for an almost impossible challenge. Even with my best blueprints, I failed due to the research RNG not coming up with good thrill rides / roller coasters to put down.

Suggestion: raise starting money or make 1-2 more high intensity thrill rides available from the beginning.
Trying once again now...
Edit: got it beat with the ol' No-Entry-Sign at park entrance cheese. Would still recommend adding 5k to starting money and or some thrill rides.