Always return to your home on Sunday evening and remain there until the bills have arrived (except to go to work/school of course) otherwise you could get stuck with a horrendous bill unless you live in an apartment in San Myshuno where you pay a fixed amount in rent.
If you're tired of the Jungle why not hang out at the cantina and pick up some culture skill. Once you have maxed that out (and it's easy to max out as it is only 5 levels) your sims will know how to defend themselves from some of the dangers, you will be able to buy secret supplies and if you have being keeping an eye on the the stalls you will have a good range of supplies. Then the next time your sims go to the jungle they will be much more likely to cope.
So kick back, enjoy the music, enjoy the local cuisine, chat to the locals, learn to rumba, keep an eye on the market stall and come back next time ready to tackle the jungle.