What are good businesses to start that are reliable?

Look at businesses that seldom fail like CPA firms. Since you would be an expert you only need space and equipment but have low cost continuing. Law offices, dental offices, medical clinics, hair dressers, nail salons, home cleaning services, lawn services, tax prep practice. Most common services businesses have high success rates.

good idea. another would be animal boarding. lots of people cant afford land so they board their horses and such at other peoples stables. they can be required to take care of them or for a higher fee you can offer to feed and water them, etc.

You need a business plan. Go to the Fiverrr site and look for business plans.

Buying property is always a good investment. But the business in it, should be successful quite fast. I don't know what field you want to be in. What are your passions and qualifications?

Running your own business doesn't leave much time for world travel.

no. Start ONE business and develop it until it's successful for at least a year or so, then maybe think about a second one. Have you written a business plan yet for the rental property idea?

You're going to take this hard, but if you need to ask (here, especially) just don't. Successful business take knowledge, effort and expertise. And LOTS of time. Shooting arrows into the air hoping one of them hits a rabbit when it comes down is a good way to lose a mountain of cash real fast.

You'll have to find vacant land which is properly zoned, get permits to build tiny houses or pads for mobile homes/RVs. You'd likely be better off buying an existing trailer park than trying to get through the planning & zoning, the permitting process, etc, if you have no experience with it. Resort-style RV parks require expensive facilities to attract the more affluent motor home vacationers, and such parks are heavily dependent on economic cycles. Mobile home parks are populated largely with very low income people, and rentals are unstable. You need to take these things into consideration - not just the entry-cost of your investment, which will be far in excess of buying, say, a 4-unit residential income property. If you have no experience managing such properties, it's a tough business to learn.

A friend of mine made quite a bit of profit by buying crappy places, fixing them up at a relatively low cost, and selling them as nice luxurious houses.