RNAV is your only approach available. If you have a 129 GPS then alt required. If you have a 146a GPS no alt required due aids.
If the area forecast indicates your last route segment can be flown under the rule no more than sct cloud below 500ft above LSALT & vis > 8k then no alt required. The difficulty is deciding from the area forecast wether this is the case at your particular destination given the sometimes vague nature of these forecasts regarding areas within the forecast and you don't know the crosswind component for your planned runway either. So my usual move is to plan for an alt anyway if there is no TAF.