I can not get any guests into my park on african oasis Can anyone help?

Click on your money (lower left). Then start doing some marketing campaigns (2-6 weeks each). Choose them wisely.

Having good rides (bet on one gently ride next to 1 or 2 thrill ones),m and also adequate entry paths (eg 15-20 max) for a 10 person ride each time will avoid they wait too much. Increase entrance path number for fast rides, and roller coaster ones.

A tip: each entrance path "segment" for rides holds 4-5 guests.

A suggestion to call guests: make 1-2 water rides (not to expensive, between 2,000 and 3,500 each) and choose:
- vehicles at max
- wait for full load
- min wait: 10 seconds
- max wait: 60 seconds
- price (it scenery allows): $4-5 per guest
Eg king rapids can hold 140 guests max, and anotehr one can hold till 120 guests max. You can increase the entrance lenght entry for such rides. On those 2 riodes you can. After a few minutes you'll have the max load on each.
A good move is to put 1 food, 1 drink, 1 bathroom, and 1 first aid (if available) next to each ride.

Vandals break trash cans and seats. When they start appearing broken, hire policemen to patroll such zones with seats and trash cans.

Entertainers will keep guests happy. Place them near waiting paths for rides whenever possible.

A final - but $1 million tip: when you can afford, hire as many handymen as possible to avoid all kinda litter. Give a zone for each one (the step icon).
Remove "grass mow" from their tasks), and water gardens too if you don't have gardens to water.
Btw, trash cans are useful but without handymen for empty them, they're useless.

Good luck.