We didn't see a bank in Mosteiros when we were there, it's little more than a village - best to go on to a web map and do a search. It's not a long drive to Ponta Delgada (but a very beautiful drive though Sete Citades) if you have to return there for bank facilities. The city is easy to drive around, but very 'tight' for space - you'll need to breath in and hold your elbows close around the older parts! As we were there in March, we dressed accordingly - lightly, but with waterproofs tucked in our backpacks - we got slightly sunburned! Do a web search for June average temperature/rainfall and pack to suit what it shows. We used 'Windy' for 5 to 6 day forecasts - it's very accurate. The sea water pools in the volcanic rock headland are amazing, but only if the Atlantic is calm. When there's a sea swell the waves really beat in. There's a kiosk there, which should be open daily by the time you get there; Sunset - Poco da Pedra Bar. The best Cheese and Ham toastie and delicious black tea (ask for milk). We had one of each, just 7Eu the lot! In the right conditions the sunsets are - as you Americans say - awesome. With a car available just get a good map 'do' the island - it's only a relatively small island after all. We put well over 400 miles on our car in 6 days. Furnas is a bit of a drive from Mosteiros, but is a village with volcanic fumaroles in it - amazing and has the smell of hell - there's a lake nearby and also a 'pond' you can swim in - heated by upwelling heated water. A drive up to one of the Miradouros (viewpoints) is worth it for the view back into the volcanic caldera, several miles across - you see the lake and village far below. We bought a Bradt tour guide before we went, it gave us several pointers on where to go. If you go to Ponta Delgada for a look-see and you want to eat very well and cheaply, find 'Lan's' little restaurant - it's super and well regarded. Enjoy your trip - the Azorean Portuguese are lovely people and very friendly.