Hi Aimee
Can't help you with the safe query but can perhaps help a little with your others.
Very difficult to guess what you will spend, but, for example, if you had an English breakfast every morning allow 5 euro, snack such as toastie daytime around 5 again then 30 euro for a reasonable evening meal including a couple of drinks, thats 560 euro each for 2 weeks and thats being generous.
If you stay around Castle Harbour some nights they do a whole take away chicken + chips + bottle of wine for 6.50 (I think)
When eating out look for the places doing 3 courses for around 10 euro, they are good value.
For stocking up on drinks, snacks etc there is a large Spar in the shopping centre 2 mins from you.
Plenty of bars/restaurants on the El Mirador strip not far from you either.
For trips Siam Park is a must, about 30 euro, you can book tickets at Status excursion shop just down the road from back entrance of Castle Harbour and there is a free bus operating.
Also you must try the whales & dolphins excursion, you can book at one of the little cabins down at Los Cristianos harbour, that should be around 20 - 25 euro. Plenty of round island trips if you want to see more of the island.
There are banana boats, paragliding, loads of things to do and of course plenty of days on one of the many beaches
Taxis are reasonably priced, or you can walk all along the promenade into Las Americas.

Thanks Vivien-Marie.
I did think we would be taking plenty of money but today you're never sure everywhere is so expensive these days!

hi aimee
me and my husband went there this year in january and have booked again the safes are safe and cheap to rent. the restaurant is good we got a full chicken ;chips and a bottle of wine to take away for 6 50 euros.the only thing you have to pay for the sunbeds unless there is some in your room. and they have a water manchine so u can fill up your water bottle which is cheaper than the shops . hope you have a good time we did