I'm pretty new to Tropico 4, playing the campaign for the first time (did play 1-3 though) and did just finish the third (I think) island where you are told to build tourism business.
My income (at end of the scenario = getting 1,000,000 twits) is $205,055 in total which splits up to
- Farming $18,464
- Mining $0
- Logging $0
- Industry $0
- Tourism $138,058 (with one arrow up)
- General Overhead $34,335 (with one arrow up)
- Foreign Aid $14,148
I didn't plan in exporting anything, I'm just exporting food because I usually build more ranches than I need as I often leave my people starving later in the game.
Concerning tourists, I did focus on the 'Wealthy'-class only building luxury hotels, beach-things (not the bunks, but the bigger ones which offer room for 2 families) and having one skyscraper hotel.
In entertainment / attractions I only use the luxury liner (which gives a lot of revenue, had something like slightly less then $400,000 total at the end), nightclubs, banks, modern art museum, gourmet restaurants, marina and spa, which I are the important ones. I only got 1 cabaret and almost none of the attractions which are listed under attractions and I got everything set on the highest settings to let it fit for the wealthy-class.
For tourist arrival I did have 3 docks and 1 airport in the end.
I did not start with the wealthy-stuff of course. At the start I did build 1 dock (and did only keep 1 for quite some time), one hotel (for free because of the perk) and 5-10 bunks (the small huts for 1 family) and as attraction a scenic spot which is a great money maker for the early and low tourists. The scenic spot (did keep it for the children of the wealthy tourists) had around $120,000 total revenue at the end, so it's good to have in my opinion(1-3 depending on how many tourists you got)
In all (small) free places around hotels / entertainment / attractions I did place parks / trees / fountains which in some cases helps a lot for the beauty-rating if you check the overlay. I'm not sure if it really affects the number / prices for tourists though, I just like my islands beautiful with a lot of small stuff :)
I did not have trouble or lack of money during this scenario. I did play pretty much the same setup on the second mission (where you are meant to build mines which I did not know, so did start with tourist-perks and did stick to it). Did work very well too, but I had 2 iron ore mines on the second island in addition to tourist business.
I think focusing on eco-tourists will work out fine too. They spend a lot in touring houses, balloon rides, maritime (boat tour-mode) and stuff like that. Slobs give me good money in restaurants, pubs and low-level entertainment / attractions in the beginning. Maybe if one does focus on these it will work in the late game too. Might try that on the next island.